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More work adding support for multiple meshes.

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This commit is contained in:
David Williams 2014-05-22 16:38:02 +02:00
parent 51e93fdabc
commit 7d55e00f76
3 changed files with 31 additions and 18 deletions
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41
examples/Basic/OpenGLWidget.cpp
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@ -19,19 +19,23 @@ void OpenGLWidget::setSurfaceMeshToRender(const PolyVox::SurfaceMesh<CubicVertex
//Convienient access to the vertices and indices
const auto& vecIndices = surfaceMesh.getIndices();
const auto& vecVertices = surfaceMesh.getVertices();
// This struct holds the OpenGL properties (buffer handles, etc) which will be used
// to render our mesh. We copy the data from the PolyVox mesh into this structure.
OpenGLMeshData meshData;
//Create the VAO for the mesh
glGenVertexArrays(1, &(mMeshData.vertexArrayObject));
glBindVertexArray(mMeshData.vertexArrayObject);
glGenVertexArrays(1, &(meshData.vertexArrayObject));
glBindVertexArray(meshData.vertexArrayObject);
//The GL_ARRAY_BUFFER will contain the list of vertex positions
glGenBuffers(1, &(mMeshData.vertexBuffer));
glBindBuffer(GL_ARRAY_BUFFER, mMeshData.vertexBuffer);
glGenBuffers(1, &(meshData.vertexBuffer));
glBindBuffer(GL_ARRAY_BUFFER, meshData.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, &(mMeshData.indexBuffer));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mMeshData.indexBuffer);
glGenBuffers(1, &(meshData.indexBuffer));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, meshData.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 +44,9 @@ void OpenGLWidget::setSurfaceMeshToRender(const PolyVox::SurfaceMesh<CubicVertex
glBindVertexArray(0);
mMeshData.noOfIndices = vecIndices.size(); //Save this for the call to glDrawElements later
meshData.noOfIndices = vecIndices.size(); //Save this for the call to glDrawElements later
mMeshData.push_back(meshData);
}
void OpenGLWidget::initializeGL()
@ -155,21 +161,24 @@ void OpenGLWidget::paintGL()
{
//Clear the screen
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
QMatrix4x4 modelToWorldMatrix{};
modelToWorldMatrix.rotate(m_xRotation, 0, 1, 0); //rotate around y-axis
modelToWorldMatrix.rotate(m_yRotation, 1, 0, 0); //rotate around x-axis
modelToWorldMatrix.translate(-32, -32, -32); //centre the model on the origin
shader.bind();
shader.setUniformValue("modelToWorldMatrix", modelToWorldMatrix); //Update to the latest camera matrix
glBindVertexArray(mMeshData.vertexArrayObject);
glDrawElements(GL_TRIANGLES, mMeshData.noOfIndices, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
for (OpenGLMeshData meshData : mMeshData)
{
glBindVertexArray(meshData.vertexArrayObject);
glDrawElements(GL_TRIANGLES, meshData.noOfIndices, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
}
shader.release();

2
examples/Basic/OpenGLWidget.h
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@ -60,7 +60,7 @@ protected:
private:
//Index/vertex buffer data
OpenGLMeshData mMeshData;
std::vector<OpenGLMeshData> mMeshData;
QGLShaderProgram shader;

6
examples/Basic/main.cpp
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@ -78,11 +78,15 @@ int main(int argc, char *argv[])
createSphereInVolume(volData, 30);
// Extract the surface for the specified region of the volume. Uncomment the line for the kind of surface extraction you want to see.
auto mesh = extractCubicSurface(&volData, volData.getEnclosingRegion());
//auto mesh = extractCubicSurface(&volData, volData.getEnclosingRegion());
//auto mesh = extractMarchingCubesSurface(&volData, volData.getEnclosingRegion());
auto mesh = extractCubicSurface(&volData, PolyVox::Region(Vector3DInt32(0, 0, 0), Vector3DInt32(31, 31, 31)));
auto mesh2 = extractCubicSurface(&volData, PolyVox::Region(Vector3DInt32(32, 32, 32), Vector3DInt32(63, 63, 63)));
//Pass the surface to the OpenGL window
openGLWidget.setSurfaceMeshToRender(mesh);
openGLWidget.setSurfaceMeshToRender(mesh2);
//Run the message pump.
return app.exec();