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Modifying the OpenGLWidget so that it can render multiple meshes.

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This commit is contained in:
David Williams
2014-05-22 16:25:36 +02:00
parent 7fc954a6bf
commit 51e93fdabc
2 changed files with 18 additions and 13 deletions
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18
examples/Basic/OpenGLWidget.cpp
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@ -21,17 +21,17 @@ void OpenGLWidget::setSurfaceMeshToRender(const PolyVox::SurfaceMesh<CubicVertex
const auto& vecVertices = surfaceMesh.getVertices();
//Create the VAO for the mesh
glGenVertexArrays(1, &vertexArrayObject);
glBindVertexArray(vertexArrayObject);
glGenVertexArrays(1, &(mMeshData.vertexArrayObject));
glBindVertexArray(mMeshData.vertexArrayObject);
//The GL_ARRAY_BUFFER will contain the list of vertex positions
glGenBuffers(1, &vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glGenBuffers(1, &(mMeshData.vertexBuffer));
glBindBuffer(GL_ARRAY_BUFFER, mMeshData.vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, vecVertices.size() * sizeof(CubicVertex<uint8_t>), vecVertices.data(), GL_STATIC_DRAW);
//and GL_ELEMENT_ARRAY_BUFFER will contain the indices
glGenBuffers(1, &indexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);
glGenBuffers(1, &(mMeshData.indexBuffer));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mMeshData.indexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, vecIndices.size() * sizeof(uint32_t), vecIndices.data(), GL_STATIC_DRAW);
//We need to tell OpenGL how to understand the format of the vertex data
@ -40,7 +40,7 @@ void OpenGLWidget::setSurfaceMeshToRender(const PolyVox::SurfaceMesh<CubicVertex
glBindVertexArray(0);
noOfIndices = vecIndices.size(); //Save this for the call to glDrawElements later
mMeshData.noOfIndices = vecIndices.size(); //Save this for the call to glDrawElements later
}
void OpenGLWidget::initializeGL()
@ -165,9 +165,9 @@ void OpenGLWidget::paintGL()
shader.setUniformValue("modelToWorldMatrix", modelToWorldMatrix); //Update to the latest camera matrix
glBindVertexArray(vertexArrayObject);
glBindVertexArray(mMeshData.vertexArrayObject);
glDrawElements(GL_TRIANGLES, noOfIndices, GL_UNSIGNED_INT, 0);
glDrawElements(GL_TRIANGLES, mMeshData.noOfIndices, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);

13
examples/Basic/OpenGLWidget.h
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@ -31,6 +31,14 @@ distribution.
#include <QGLWidget>
#include <QGLShaderProgram>
struct OpenGLMeshData
{
GLuint noOfIndices;
GLuint indexBuffer;
GLuint vertexBuffer;
GLuint vertexArrayObject;
};
class OpenGLWidget : public QGLWidget
{
public:
@ -52,10 +60,7 @@ protected:
private:
//Index/vertex buffer data
GLuint noOfIndices;
GLuint indexBuffer;
GLuint vertexBuffer;
GLuint vertexArrayObject;
OpenGLMeshData mMeshData;
QGLShaderProgram shader;