1047 lines
24 KiB
C
1047 lines
24 KiB
C
/*
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* Copyright (c) 2016-2019 Irlan Robson https://irlanrobson.github.io
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef DRAW_GL2_H
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#define DRAW_GL2_H
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#include <glad_2/glad.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <bounce/common/math/transform.h>
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#include <bounce/common/math/mat44.h>
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#include <bounce/common/draw.h>
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#define BUFFER_OFFSET(i) ((char*)NULL + (i))
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extern bool g_glDrawPoints;
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extern bool g_glDrawLines;
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extern bool g_glDrawTriangles;
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extern b3Mat44 g_glViewMatrix;
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extern b3Mat44 g_glProjectionMatrix;
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static void AssertGL()
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{
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GLenum errorCode = glGetError();
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if (errorCode != GL_NO_ERROR)
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{
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fprintf(stderr, "OpenGL error = %d\n", errorCode);
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assert(false);
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}
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}
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static void PrintLog(GLuint id)
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{
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GLint log_length = 0;
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if (glIsShader(id))
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{
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glGetShaderiv(id, GL_INFO_LOG_LENGTH, &log_length);
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}
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else if (glIsProgram(id))
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{
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glGetProgramiv(id, GL_INFO_LOG_LENGTH, &log_length);
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}
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else
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{
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fprintf(stderr, "Not a shader or a program\n");
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return;
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}
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char* log = (char*)malloc(log_length);
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if (glIsShader(id))
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{
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glGetShaderInfoLog(id, log_length, NULL, log);
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}
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else if (glIsProgram(id))
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{
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glGetProgramInfoLog(id, log_length, NULL, log);
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}
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fprintf(stderr, "%s", log);
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free(log);
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}
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static GLuint CreateShader(const char* source, GLenum type)
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{
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GLuint shaderId = glCreateShader(type);
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const char* sources[] = { source };
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glShaderSource(shaderId, 1, sources, NULL);
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glCompileShader(shaderId);
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GLint status = GL_FALSE;
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glGetShaderiv(shaderId, GL_COMPILE_STATUS, &status);
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if (status == GL_FALSE)
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{
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fprintf(stderr, "Error compiling %d shader.\n", type);
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PrintLog(shaderId);
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glDeleteShader(shaderId);
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return 0;
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}
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return shaderId;
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}
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//
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static GLuint CreateShaderProgram(const char* vs, const char* fs)
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{
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GLuint vsId = CreateShader(vs, GL_VERTEX_SHADER);
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GLuint fsId = CreateShader(fs, GL_FRAGMENT_SHADER);
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assert(vsId != 0 && fsId != 0);
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GLuint programId = glCreateProgram();
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glAttachShader(programId, vsId);
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glAttachShader(programId, fsId);
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glLinkProgram(programId);
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glDeleteShader(vsId);
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glDeleteShader(fsId);
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GLint status = GL_FALSE;
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glGetProgramiv(programId, GL_LINK_STATUS, &status);
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assert(status != GL_FALSE);
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return programId;
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}
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struct DrawPoints
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{
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DrawPoints()
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{
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const char* vs = \
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"#version 120\n"
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"uniform mat4 projectionMatrix;\n"
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"attribute vec3 v_position;\n"
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"attribute vec4 v_color;\n"
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"attribute float v_size;\n"
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"varying vec4 f_color;\n"
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"void main()\n"
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"{\n"
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" f_color = v_color;\n"
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" gl_Position = projectionMatrix * vec4(v_position, 1.0f);\n"
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" gl_PointSize = v_size;\n"
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"}\n";
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const char* fs = \
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"#version 120\n"
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"varying vec4 f_color;\n"
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"void main(void)\n"
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"{\n"
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" gl_FragColor = f_color;\n"
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"}\n";
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m_programId = CreateShaderProgram(vs, fs);
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m_projectionUniform = glGetUniformLocation(m_programId, "projectionMatrix");
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m_vertexAttribute = glGetAttribLocation(m_programId, "v_position");
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m_colorAttribute = glGetAttribLocation(m_programId, "v_color");
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m_sizeAttribute = glGetAttribLocation(m_programId, "v_size");
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glGenBuffers(3, m_vboIds);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(b3Vec3), m_vertices, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(b3Color), m_colors, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[2]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(float32), m_sizes, GL_DYNAMIC_DRAW);
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AssertGL();
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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m_count = 0;
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}
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~DrawPoints()
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{
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glDeleteProgram(m_programId);
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glDeleteBuffers(3, m_vboIds);
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}
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void Vertex(const b3Vec3& v, float32 size, const b3Color& color)
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{
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if (m_count == e_vertexCapacity)
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{
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Flush();
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}
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m_vertices[m_count] = v;
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m_colors[m_count] = color;
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m_sizes[m_count] = size;
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++m_count;
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}
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void Flush()
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{
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if (m_count == 0)
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{
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return;
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}
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if (!g_glDrawPoints)
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{
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m_count = 0;
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return;
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}
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glUseProgram(m_programId);
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b3Mat44 m1 = g_glViewMatrix;
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b3Mat44 m2 = g_glProjectionMatrix;
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b3Mat44 m = m2 * m1;
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glUniformMatrix4fv(m_projectionUniform, 1, GL_FALSE, &m.x.x);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(b3Vec3), m_vertices);
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glVertexAttribPointer(m_vertexAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glEnableVertexAttribArray(m_vertexAttribute);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(b3Color), m_colors);
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glEnableVertexAttribArray(m_colorAttribute);
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glVertexAttribPointer(m_colorAttribute, 4, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[2]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(float32), m_sizes);
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glEnableVertexAttribArray(m_sizeAttribute);
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glVertexAttribPointer(m_sizeAttribute, 1, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
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glDrawArrays(GL_POINTS, 0, m_count);
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glDisable(GL_VERTEX_PROGRAM_POINT_SIZE);
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glDisableVertexAttribArray(m_sizeAttribute);
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glDisableVertexAttribArray(m_colorAttribute);
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glDisableVertexAttribArray(m_vertexAttribute);
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AssertGL();
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glUseProgram(0);
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m_count = 0;
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}
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enum
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{
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e_vertexCapacity = 1024
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};
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b3Vec3 m_vertices[e_vertexCapacity];
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b3Color m_colors[e_vertexCapacity];
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float32 m_sizes[e_vertexCapacity];
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u32 m_count;
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GLuint m_programId;
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GLuint m_projectionUniform;
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GLuint m_vertexAttribute;
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GLuint m_colorAttribute;
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GLuint m_sizeAttribute;
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GLuint m_vboIds[3];
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};
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struct DrawLines
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{
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DrawLines()
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{
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const char* vs = \
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"#version 120\n"
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"uniform mat4 projectionMatrix;\n"
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"attribute vec3 v_position;\n"
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"attribute vec4 v_color;\n"
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"varying vec4 f_color;\n"
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"void main(void)\n"
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"{\n"
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" f_color = v_color;\n"
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" gl_Position = projectionMatrix * vec4(v_position, 1.0f);\n"
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"}\n";
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const char* fs = \
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"#version 120\n"
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"varying vec4 f_color;\n"
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"void main(void)\n"
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"{\n"
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" gl_FragColor = f_color;\n"
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"}\n";
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m_programId = CreateShaderProgram(vs, fs);
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m_projectionUniform = glGetUniformLocation(m_programId, "projectionMatrix");
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m_vertexAttribute = glGetAttribLocation(m_programId, "v_position");
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m_colorAttribute = glGetAttribLocation(m_programId, "v_color");
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glGenBuffers(2, m_vboIds);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(b3Vec3), m_vertices, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(b3Color), m_colors, GL_DYNAMIC_DRAW);
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AssertGL();
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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m_count = 0;
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}
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~DrawLines()
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{
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glDeleteProgram(m_programId);
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glDeleteBuffers(2, m_vboIds);
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}
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void Vertex(const b3Vec3& v, const b3Color& c)
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{
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if (m_count == e_vertexCapacity)
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{
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Flush();
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}
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m_vertices[m_count] = v;
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m_colors[m_count] = c;
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++m_count;
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}
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void Flush()
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{
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if (m_count == 0)
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{
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return;
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}
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if (!g_glDrawLines)
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{
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m_count = 0;
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return;
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}
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glUseProgram(m_programId);
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b3Mat44 m1 = g_glViewMatrix;
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b3Mat44 m2 = g_glProjectionMatrix;
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b3Mat44 m = m2 * m1;
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glUniformMatrix4fv(m_projectionUniform, 1, GL_FALSE, &m.x.x);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(b3Vec3), m_vertices);
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glVertexAttribPointer(m_vertexAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glEnableVertexAttribArray(m_vertexAttribute);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(b3Color), m_colors);
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glEnableVertexAttribArray(m_colorAttribute);
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glVertexAttribPointer(m_colorAttribute, 4, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glDrawArrays(GL_LINES, 0, m_count);
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AssertGL();
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glDisableVertexAttribArray(m_colorAttribute);
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glEnableVertexAttribArray(m_vertexAttribute);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glUseProgram(0);
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m_count = 0;
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}
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enum
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{
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e_vertexCapacity = 2 * 1024
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};
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b3Vec3 m_vertices[e_vertexCapacity];
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b3Color m_colors[e_vertexCapacity];
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u32 m_count;
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GLuint m_programId;
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GLuint m_projectionUniform;
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GLuint m_vertexAttribute;
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GLuint m_colorAttribute;
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GLuint m_vboIds[2];
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};
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struct DrawTriangles
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{
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DrawTriangles()
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{
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const char* vs = \
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"#version 120\n"
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"uniform mat4 projectionMatrix;\n"
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"attribute vec3 v_position;\n"
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"attribute vec4 v_color;\n"
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"attribute vec3 v_normal;\n"
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"varying vec4 f_color;\n"
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"void main(void)\n"
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"{\n"
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" vec3 La = vec3(0.5f, 0.5f, 0.5f);\n"
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" vec3 Ld = vec3(0.5f, 0.5f, 0.5f);\n"
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" vec3 L = vec3(0.0f, 0.3f, 0.7f);\n"
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" vec3 Ma = v_color.xyz;\n"
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" vec3 Md = v_color.xyz;\n"
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" vec3 a = La * Ma;\n"
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" vec3 d = max(dot(v_normal, L), 0.0f) * Ld * Md;\n"
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" f_color = vec4(a + d, v_color.w);\n"
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" gl_Position = projectionMatrix * vec4(v_position, 1.0f);\n"
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"}\n";
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const char* fs = \
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"#version 120\n"
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"varying vec4 f_color;\n"
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"void main(void)\n"
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"{\n"
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" gl_FragColor = f_color;\n"
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"}\n";
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m_programId = CreateShaderProgram(vs, fs);
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m_projectionUniform = glGetUniformLocation(m_programId, "projectionMatrix");
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m_vertexAttribute = glGetAttribLocation(m_programId, "v_position");
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m_colorAttribute = glGetAttribLocation(m_programId, "v_color");
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m_normalAttribute = glGetAttribLocation(m_programId, "v_normal");
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glGenBuffers(3, m_vboIds);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(b3Vec3), m_vertices, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(b3Color), m_colors, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[2]);
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glBufferData(GL_ARRAY_BUFFER, e_vertexCapacity * sizeof(b3Vec3), m_normals, GL_DYNAMIC_DRAW);
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AssertGL();
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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m_count = 0;
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}
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~DrawTriangles()
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{
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glDeleteProgram(m_programId);
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glDeleteBuffers(3, m_vboIds);
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}
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void Vertex(const b3Vec3& v, const b3Color& c, const b3Vec3& n)
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{
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if (m_count == e_vertexCapacity)
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{
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Flush();
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}
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m_vertices[m_count] = v;
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m_colors[m_count] = c;
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m_normals[m_count] = n;
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++m_count;
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}
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void Flush()
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{
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if (m_count == 0)
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{
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return;
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}
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if (!g_glDrawTriangles)
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{
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m_count = 0;
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return;
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}
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glUseProgram(m_programId);
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b3Mat44 m1 = g_glViewMatrix;
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b3Mat44 m2 = g_glProjectionMatrix;
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b3Mat44 m = m2 * m1;
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glUniformMatrix4fv(m_projectionUniform, 1, GL_FALSE, &m.x.x);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(b3Vec3), m_vertices);
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glVertexAttribPointer(m_vertexAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glEnableVertexAttribArray(m_vertexAttribute);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(b3Color), m_colors);
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glVertexAttribPointer(m_colorAttribute, 4, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glEnableVertexAttribArray(m_colorAttribute);
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glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[2]);
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glBufferSubData(GL_ARRAY_BUFFER, 0, m_count * sizeof(b3Vec3), m_normals);
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glVertexAttribPointer(m_normalAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
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glEnableVertexAttribArray(m_normalAttribute);
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glDrawArrays(GL_TRIANGLES, 0, m_count);
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AssertGL();
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glDisableVertexAttribArray(m_normalAttribute);
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glDisableVertexAttribArray(m_colorAttribute);
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glDisableVertexAttribArray(m_vertexAttribute);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glUseProgram(0);
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m_count = 0;
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}
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enum
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|
{
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e_vertexCapacity = 3 * 512
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};
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|
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b3Vec3 m_vertices[e_vertexCapacity];
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|
b3Color m_colors[e_vertexCapacity];
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|
b3Vec3 m_normals[e_vertexCapacity];
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u32 m_count;
|
|
|
|
GLuint m_programId;
|
|
GLuint m_projectionUniform;
|
|
GLuint m_vertexAttribute;
|
|
GLuint m_colorAttribute;
|
|
GLuint m_normalAttribute;
|
|
|
|
GLuint m_vboIds[3];
|
|
};
|
|
|
|
struct DrawWireSphere
|
|
{
|
|
enum
|
|
{
|
|
e_rings = 12,
|
|
e_sectors = 12,
|
|
e_vertexCount = e_rings * e_sectors,
|
|
e_indexCount = (e_rings - 1) * (e_sectors - 1) * 8
|
|
};
|
|
|
|
DrawWireSphere()
|
|
{
|
|
float32 R = 1.0f / float32(e_rings - 1);
|
|
float32 S = 1.0f / float32(e_sectors - 1);
|
|
|
|
b3Vec3 vs[e_vertexCount];
|
|
b3Vec3 ns[e_vertexCount];
|
|
b3Color cs[e_vertexCount];
|
|
|
|
u32 vc = 0;
|
|
for (u32 r = 0; r < e_rings; r++)
|
|
{
|
|
for (u32 s = 0; s < e_sectors; s++)
|
|
{
|
|
float32 y = sin(-0.5f * B3_PI + B3_PI * r * R);
|
|
float32 x = cos(2.0f * B3_PI * s * S) * sin(B3_PI * r * R);
|
|
float32 z = sin(2.0f * B3_PI * s * S) * sin(B3_PI * r * R);
|
|
|
|
vs[vc].Set(x, y, z);
|
|
cs[vc] = b3Color(1.0f, 1.0f, 1.0f, 1.0f);
|
|
++vc;
|
|
}
|
|
}
|
|
|
|
u32 is[e_indexCount];
|
|
|
|
u32 ic = 0;
|
|
for (u32 r = 0; r < e_rings - 1; r++)
|
|
{
|
|
for (u32 s = 0; s < e_sectors - 1; s++)
|
|
{
|
|
u32 i1 = r * e_sectors + s;
|
|
u32 i2 = (r + 1) * e_sectors + s;
|
|
u32 i3 = (r + 1) * e_sectors + (s + 1);
|
|
u32 i4 = r * e_sectors + (s + 1);
|
|
|
|
is[ic++] = i1;
|
|
is[ic++] = i2;
|
|
|
|
is[ic++] = i2;
|
|
is[ic++] = i3;
|
|
|
|
is[ic++] = i3;
|
|
is[ic++] = i4;
|
|
|
|
is[ic++] = i4;
|
|
is[ic++] = i1;
|
|
}
|
|
}
|
|
|
|
glGenBuffers(1, &m_vboId);
|
|
glGenBuffers(1, &m_iboId);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_vboId);
|
|
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), vs, GL_STATIC_DRAW);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_iboId);
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER, ic * sizeof(u32), is, GL_STATIC_DRAW);
|
|
|
|
AssertGL();
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
}
|
|
|
|
~DrawWireSphere()
|
|
{
|
|
glDeleteBuffers(1, &m_vboId);
|
|
glDeleteBuffers(1, &m_iboId);
|
|
}
|
|
|
|
GLuint m_vboId;
|
|
GLuint m_iboId;
|
|
};
|
|
|
|
struct DrawWire
|
|
{
|
|
DrawWire()
|
|
{
|
|
const char* vs = \
|
|
"#version 120\n"
|
|
"uniform vec4 color;\n"
|
|
"uniform mat4 projectionMatrix;\n"
|
|
"attribute vec3 v_position;\n"
|
|
"varying vec4 f_color;\n"
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" f_color = color;\n"
|
|
" gl_Position = projectionMatrix * vec4(v_position, 1.0f);\n"
|
|
"}\n";
|
|
|
|
const char* fs = \
|
|
"#version 120\n"
|
|
"varying vec4 f_color;\n"
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" gl_FragColor = f_color;\n"
|
|
"}\n";
|
|
|
|
m_programId = CreateShaderProgram(vs, fs);
|
|
m_colorUniform = glGetUniformLocation(m_programId, "color");
|
|
m_projectionUniform = glGetUniformLocation(m_programId, "projectionMatrix");
|
|
m_vertexAttribute = glGetAttribLocation(m_programId, "v_position");
|
|
}
|
|
|
|
~DrawWire()
|
|
{
|
|
glDeleteProgram(m_programId);
|
|
}
|
|
|
|
void DrawSphere(float32 radius, const b3Color& c, const b3Transform& xf)
|
|
{
|
|
if (!g_glDrawLines)
|
|
{
|
|
return;
|
|
}
|
|
|
|
glUseProgram(m_programId);
|
|
|
|
b3Mat44 m1 = b3TransformMat44(xf);
|
|
m1.x = radius * m1.x;
|
|
m1.y = radius * m1.y;
|
|
m1.z = radius * m1.z;
|
|
b3Mat44 m2 = g_glViewMatrix;
|
|
b3Mat44 m3 = g_glProjectionMatrix;
|
|
b3Mat44 m = m3 * m2 * m1;
|
|
|
|
glUniformMatrix4fv(m_projectionUniform, 1, GL_FALSE, &m.x.x);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_sphere.m_vboId);
|
|
glVertexAttribPointer(m_vertexAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
|
|
glEnableVertexAttribArray(m_vertexAttribute);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_sphere.m_iboId);
|
|
glDrawElements(GL_LINES, m_sphere.e_indexCount, GL_UNSIGNED_INT, BUFFER_OFFSET(0));
|
|
|
|
glDisableVertexAttribArray(m_vertexAttribute);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
|
|
glUseProgram(0);
|
|
}
|
|
|
|
GLuint m_programId;
|
|
GLuint m_colorUniform;
|
|
GLuint m_projectionUniform;
|
|
GLuint m_vertexAttribute;
|
|
|
|
DrawWireSphere m_sphere;
|
|
};
|
|
|
|
struct DrawSolidSphere
|
|
{
|
|
enum
|
|
{
|
|
e_rings = 18,
|
|
e_sectors = 18,
|
|
e_vertexCount = e_rings * e_sectors,
|
|
e_indexCount = (e_rings - 1) * (e_sectors - 1) * 6,
|
|
e_faceCount = e_indexCount / 3
|
|
};
|
|
|
|
DrawSolidSphere()
|
|
{
|
|
float32 R = 1.0f / float32(e_rings - 1);
|
|
float32 S = 1.0f / float32(e_sectors - 1);
|
|
|
|
b3Vec3 vs[e_vertexCount];
|
|
b3Vec3 ns[e_vertexCount];
|
|
|
|
u32 vc = 0;
|
|
for (u32 r = 0; r < e_rings; r++)
|
|
{
|
|
for (u32 s = 0; s < e_sectors; s++)
|
|
{
|
|
float32 a1 = 2.0f * B3_PI * float32(s) * S;
|
|
float32 c1 = cos(a1);
|
|
float32 s1 = sin(a1);
|
|
|
|
float32 a2 = -0.5f * B3_PI + B3_PI * float32(r) * R;
|
|
float32 s2 = sin(a2);
|
|
|
|
float32 a3 = B3_PI * float32(r) * R;
|
|
float32 s3 = sin(a3);
|
|
|
|
float32 x = c1 * s3;
|
|
float32 y = s2;
|
|
float32 z = s1 * s3;
|
|
|
|
b3Vec3 v(x, y, z);
|
|
v.Normalize();
|
|
|
|
vs[vc] = v;
|
|
ns[vc] = v;
|
|
++vc;
|
|
}
|
|
}
|
|
|
|
u32 is[e_indexCount];
|
|
|
|
u32 ic = 0;
|
|
for (u32 r = 0; r < e_rings - 1; r++)
|
|
{
|
|
for (u32 s = 0; s < e_sectors - 1; s++)
|
|
{
|
|
u32 i1 = r * e_sectors + s;
|
|
u32 i2 = (r + 1) * e_sectors + s;
|
|
u32 i3 = (r + 1) * e_sectors + (s + 1);
|
|
u32 i4 = r * e_sectors + (s + 1);
|
|
|
|
is[ic++] = i1;
|
|
is[ic++] = i2;
|
|
is[ic++] = i3;
|
|
|
|
is[ic++] = i1;
|
|
is[ic++] = i3;
|
|
is[ic++] = i4;
|
|
}
|
|
}
|
|
|
|
glGenBuffers(3, m_vboIds);
|
|
glGenBuffers(1, &m_iboId);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
|
|
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), vs, GL_STATIC_DRAW);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
|
|
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), ns, GL_STATIC_DRAW);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_iboId);
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER, ic * sizeof(u32), is, GL_STATIC_DRAW);
|
|
|
|
AssertGL();
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
}
|
|
|
|
~DrawSolidSphere()
|
|
{
|
|
glDeleteBuffers(2, m_vboIds);
|
|
glDeleteBuffers(1, &m_iboId);
|
|
}
|
|
|
|
GLuint m_vboIds[2];
|
|
GLuint m_iboId;
|
|
};
|
|
|
|
struct DrawSolidCylinder
|
|
{
|
|
enum
|
|
{
|
|
e_segments = 64,
|
|
e_vertexCount = e_segments * 6,
|
|
};
|
|
|
|
DrawSolidCylinder()
|
|
{
|
|
b3Vec3 vs[e_vertexCount];
|
|
b3Vec3 ns[e_vertexCount];
|
|
|
|
u32 vc = 0;
|
|
for (u32 i = 0; i < e_segments; ++i)
|
|
{
|
|
float32 t0 = 2.0f * B3_PI * float32(i) / float32(e_segments);
|
|
float32 t1 = 2.0f * B3_PI * float32(i + 1) / float32(e_segments);
|
|
|
|
float32 c0 = cos(t0);
|
|
float32 s0 = sin(t0);
|
|
|
|
float32 c1 = cos(t1);
|
|
float32 s1 = sin(t1);
|
|
|
|
b3Vec3 v1;
|
|
v1.x = s0;
|
|
v1.y = -0.5f;
|
|
v1.z = c0;
|
|
|
|
b3Vec3 v2;
|
|
v2.x = s1;
|
|
v2.y = -0.5f;
|
|
v2.z = c1;
|
|
|
|
b3Vec3 v3;
|
|
v3.x = s1;
|
|
v3.y = 0.5f;
|
|
v3.z = c1;
|
|
|
|
b3Vec3 v4;
|
|
v4.x = s0;
|
|
v4.y = 0.5f;
|
|
v4.z = c0;
|
|
|
|
b3Vec3 n = b3Cross(v2 - v1, v3 - v1);
|
|
n.Normalize();
|
|
|
|
vs[vc] = v1;
|
|
ns[vc] = n;
|
|
++vc;
|
|
|
|
vs[vc] = v2;
|
|
ns[vc] = n;
|
|
++vc;
|
|
|
|
vs[vc] = v3;
|
|
ns[vc] = n;
|
|
++vc;
|
|
|
|
vs[vc] = v1;
|
|
ns[vc] = n;
|
|
++vc;
|
|
|
|
vs[vc] = v3;
|
|
ns[vc] = n;
|
|
++vc;
|
|
|
|
vs[vc] = v4;
|
|
ns[vc] = n;
|
|
++vc;
|
|
}
|
|
|
|
u32 is[e_vertexCount];
|
|
|
|
u32 ic = vc;
|
|
for (u32 i = 0; i < vc; ++i)
|
|
{
|
|
is[i] = i;
|
|
}
|
|
|
|
glGenBuffers(2, m_vboIds);
|
|
glGenBuffers(1, &m_iboId);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
|
|
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), vs, GL_STATIC_DRAW);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[1]);
|
|
glBufferData(GL_ARRAY_BUFFER, vc * sizeof(b3Vec3), ns, GL_STATIC_DRAW);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_iboId);
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER, ic * sizeof(u32), is, GL_STATIC_DRAW);
|
|
|
|
AssertGL();
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
}
|
|
|
|
~DrawSolidCylinder()
|
|
{
|
|
glDeleteBuffers(2, m_vboIds);
|
|
glDeleteBuffers(1, &m_iboId);
|
|
}
|
|
|
|
GLuint m_vboIds[2];
|
|
GLuint m_iboId;
|
|
};
|
|
|
|
struct DrawSolid
|
|
{
|
|
DrawSolid()
|
|
{
|
|
const char* vs = \
|
|
"#version 120\n"
|
|
"uniform vec4 color;\n"
|
|
"uniform mat4 modelMatrix;\n"
|
|
"uniform mat4 projectionMatrix;\n"
|
|
"attribute vec3 v_position;\n"
|
|
"attribute vec3 v_normal;\n"
|
|
"varying vec4 f_color;\n"
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" vec3 f_normal = normalize( ( modelMatrix * vec4(v_normal, 0.0f) ).xyz );\n"
|
|
" gl_Position = projectionMatrix * vec4(v_position, 1.0f);\n"
|
|
" vec3 La = vec3(0.5f, 0.5f, 0.5f);\n"
|
|
" vec3 Ld = vec3(0.5f, 0.5f, 0.5f);\n"
|
|
" vec3 L = vec3(0.0f, 0.3f, 0.7f);\n"
|
|
" vec3 Ma = color.xyz;\n"
|
|
" vec3 Md = color.xyz;\n"
|
|
" vec3 a = La * Ma;\n"
|
|
" vec3 d = max(dot(f_normal, L), 0.0f) * Ld * Md;\n"
|
|
" f_color = vec4(a + d, color.w);\n"
|
|
"}\n";
|
|
|
|
const char* fs = \
|
|
"#version 120\n"
|
|
"varying vec4 f_color;\n"
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" gl_FragColor = f_color;\n"
|
|
"}\n";
|
|
|
|
m_programId = CreateShaderProgram(vs, fs);
|
|
m_colorUniform = glGetUniformLocation(m_programId, "color");
|
|
m_modelUniform = glGetUniformLocation(m_programId, "modelMatrix");
|
|
m_projectionUniform = glGetUniformLocation(m_programId, "projectionMatrix");
|
|
m_vertexAttribute = glGetAttribLocation(m_programId, "v_position");
|
|
m_normalAttribute = glGetAttribLocation(m_programId, "v_normal");
|
|
}
|
|
|
|
~DrawSolid()
|
|
{
|
|
}
|
|
|
|
void DrawCylinder(float32 radius, float32 height, const b3Color& c, const b3Transform& xf)
|
|
{
|
|
if (!g_glDrawTriangles)
|
|
{
|
|
return;
|
|
}
|
|
|
|
glUseProgram(m_programId);
|
|
|
|
b3Mat44 m1 = b3TransformMat44(xf);
|
|
m1.x = radius * m1.x;
|
|
m1.y = height * m1.y;
|
|
m1.z = radius * m1.z;
|
|
|
|
b3Mat44 m2 = g_glViewMatrix;
|
|
b3Mat44 m3 = g_glProjectionMatrix;
|
|
b3Mat44 m = m3 * m2 * m1;
|
|
|
|
glUniform4fv(m_colorUniform, 1, &c.r);
|
|
glUniformMatrix4fv(m_modelUniform, 1, GL_FALSE, &m1.x.x);
|
|
glUniformMatrix4fv(m_projectionUniform, 1, GL_FALSE, &m.x.x);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_cylinder.m_vboIds[0]);
|
|
glVertexAttribPointer(m_vertexAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
|
|
glEnableVertexAttribArray(m_vertexAttribute);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_cylinder.m_vboIds[1]);
|
|
glVertexAttribPointer(m_normalAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
|
|
glEnableVertexAttribArray(m_normalAttribute);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_cylinder.m_iboId);
|
|
glDrawElements(GL_TRIANGLES, m_cylinder.e_vertexCount, GL_UNSIGNED_INT, BUFFER_OFFSET(0));
|
|
|
|
glDisableVertexAttribArray(m_normalAttribute);
|
|
|
|
glDisableVertexAttribArray(m_vertexAttribute);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
|
|
glUseProgram(0);
|
|
}
|
|
|
|
void DrawSphere(float32 radius, const b3Color& c, const b3Transform& xf)
|
|
{
|
|
if (!g_glDrawTriangles)
|
|
{
|
|
return;
|
|
}
|
|
|
|
glUseProgram(m_programId);
|
|
|
|
b3Mat44 m1 = b3TransformMat44(xf);
|
|
m1.x = radius * m1.x;
|
|
m1.y = radius * m1.y;
|
|
m1.z = radius * m1.z;
|
|
|
|
b3Mat44 m2 = g_glViewMatrix;
|
|
b3Mat44 m3 = g_glProjectionMatrix;
|
|
b3Mat44 m = m3 * m2 * m1;
|
|
|
|
glUniform4fv(m_colorUniform, 1, &c.r);
|
|
glUniformMatrix4fv(m_modelUniform, 1, GL_FALSE, &m1.x.x);
|
|
glUniformMatrix4fv(m_projectionUniform, 1, GL_FALSE, &m.x.x);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_sphere.m_vboIds[0]);
|
|
glVertexAttribPointer(m_vertexAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
|
|
glEnableVertexAttribArray(m_vertexAttribute);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, m_sphere.m_vboIds[1]);
|
|
glVertexAttribPointer(m_normalAttribute, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
|
|
glEnableVertexAttribArray(m_normalAttribute);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_sphere.m_iboId);
|
|
glDrawElements(GL_TRIANGLES, m_sphere.e_indexCount, GL_UNSIGNED_INT, BUFFER_OFFSET(0));
|
|
|
|
glDisableVertexAttribArray(m_normalAttribute);
|
|
|
|
glDisableVertexAttribArray(m_vertexAttribute);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
|
|
glUseProgram(0);
|
|
}
|
|
|
|
GLuint m_programId;
|
|
GLuint m_colorUniform;
|
|
GLuint m_modelUniform;
|
|
GLuint m_projectionUniform;
|
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GLuint m_vertexAttribute;
|
|
GLuint m_normalAttribute;
|
|
|
|
DrawSolidSphere m_sphere;
|
|
DrawSolidCylinder m_cylinder;
|
|
};
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#endif |