COpenGLGrassRenderer::COpenGLGrassRenderer(COpenGLRenderDevice *pRenderDevice)
: m_pRenderDevice(pRenderDevice), m_GrassTextureID(0),
m_vDefaultGrassSize(0.5f, 1.0f, 0.0f),
m_nGrassClusterVBOID(0), m_nGrassClusterIndexVBOID(0), m_nGrassClusterVAOID(0),
m_GrassClusterInstanceVBID(0)
{
m_GrassClusterInstanceArray.ensureStorageAllocated(INIT_GRASSCLUSTERINSTANCE_NUM);
// Local Grass Cluster Vertex and Index
/*
0 1
|-----------|
| |
| |
| |
|-----------|
3 2
*/
uint16 grassIndex[6*3] = { 0, 2, 1, 0, 3, 2, 4, 6, 5, 4, 7, 6, 8, 10, 9, 8, 11, 10 };
SGPVertex_GRASS grassLocalVertex[4*3];
Vector3D OffsetVector(m_vDefaultGrassSize.x, 0, 0);
Matrix4x4 RotMat;
for( int i=-1; i<=1; i++ )
{
RotMat.RotationY( i * 60.0f * pi_over_180 );
OffsetVector.RotateWith(RotMat);
if( i == 0 )
OffsetVector.Set(m_vDefaultGrassSize.x, 0, 0);
grassLocalVertex[(i+1)*4 + 0].x = -OffsetVector.x;
grassLocalVertex[(i+1)*4 + 0].y = -OffsetVector.y;
grassLocalVertex[(i+1)*4 + 0].z = -OffsetVector.z;
grassLocalVertex[(i+1)*4 + 0].tu = 0; grassLocalVertex[(i+1)*4 + 0].tv = 0;
grassLocalVertex[(i+1)*4 + 1].x = OffsetVector.x;
grassLocalVertex[(i+1)*4 + 1].y = OffsetVector.y;
grassLocalVertex[(i+1)*4 + 1].z = OffsetVector.z;
grassLocalVertex[(i+1)*4 + 1].tu = 1; grassLocalVertex[(i+1)*4 + 1].tv = 0;
grassLocalVertex[(i+1)*4 + 2].x = OffsetVector.x;
grassLocalVertex[(i+1)*4 + 2].y = OffsetVector.y;
grassLocalVertex[(i+1)*4 + 2].z = OffsetVector.z;
grassLocalVertex[(i+1)*4 + 2].tu = 1; grassLocalVertex[(i+1)*4 + 2].tv = 1;
grassLocalVertex[(i+1)*4 + 3].x = -OffsetVector.x;
grassLocalVertex[(i+1)*4 + 3].y = -OffsetVector.y;
grassLocalVertex[(i+1)*4 + 3].z = -OffsetVector.z;
grassLocalVertex[(i+1)*4 + 3].tu = 0; grassLocalVertex[(i+1)*4 + 3].tv = 1;
}
GLsizei nStride = sizeof(SGPVertex_GRASS);
// create one GrassCluster VAO and VBO
m_pRenderDevice->extGlGenVertexArray(1, &m_nGrassClusterVAOID);
m_pRenderDevice->extGlBindVertexArray(m_nGrassClusterVAOID);
m_pRenderDevice->extGlGenBuffers(1, &m_nGrassClusterVBOID);
m_pRenderDevice->extGlBindBuffer(GL_ARRAY_BUFFER, m_nGrassClusterVBOID);
m_pRenderDevice->extGlBufferData(GL_ARRAY_BUFFER, 4*3*nStride, grassLocalVertex, GL_STATIC_DRAW);
m_pRenderDevice->extGlEnableVertexAttribArray(0);
m_pRenderDevice->extGlVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(0));
m_pRenderDevice->extGlEnableVertexAttribArray(1);
m_pRenderDevice->extGlVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(3*sizeof(float)));
// Instance VertexBuffer
nStride = sizeof(SGPVertex_GRASS_Cluster);
m_pRenderDevice->extGlGenBuffers(1, &m_GrassClusterInstanceVBID);
m_pRenderDevice->extGlBindBuffer(GL_ARRAY_BUFFER, m_GrassClusterInstanceVBID);
m_pRenderDevice->extGlBufferData(GL_ARRAY_BUFFER, INIT_GRASSCLUSTERINSTANCE_NUM * nStride, NULL, GL_STREAM_DRAW);
m_pRenderDevice->extGlEnableVertexAttribArray(2);
m_pRenderDevice->extGlVertexAttribPointer(2, 4, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(0));
m_pRenderDevice->extGlVertexAttribDivisor(2, 1);
m_pRenderDevice->extGlEnableVertexAttribArray(3);
m_pRenderDevice->extGlVertexAttribPointer(3, 4, GL_UNSIGNED_BYTE, GL_TRUE, nStride, (GLvoid *)BUFFER_OFFSET(4*sizeof(float)));
m_pRenderDevice->extGlVertexAttribDivisor(3, 1);
m_pRenderDevice->extGlEnableVertexAttribArray(4);
m_pRenderDevice->extGlVertexAttribPointer(4, 4, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(4*sizeof(float)+4*sizeof(uint8)));
m_pRenderDevice->extGlVertexAttribDivisor(4, 1);
m_pRenderDevice->extGlEnableVertexAttribArray(5);
m_pRenderDevice->extGlVertexAttribPointer(5, 4, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(8*sizeof(float)+4*sizeof(uint8)));
m_pRenderDevice->extGlVertexAttribDivisor(5, 1);
m_pRenderDevice->extGlGenBuffers(1, &m_nGrassClusterIndexVBOID);
m_pRenderDevice->extGlBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_nGrassClusterIndexVBOID);
m_pRenderDevice->extGlBufferData(GL_ELEMENT_ARRAY_BUFFER, 6*3*sizeof(uint16), grassIndex, GL_STATIC_DRAW);
m_pRenderDevice->extGlBindVertexArray(0);
}
COpenGLES2GrassRenderer::COpenGLES2GrassRenderer(COpenGLES2RenderDevice *pRenderDevice)
: m_pRenderDevice(pRenderDevice), m_GrassTextureID(0),
m_vDefaultGrassSize(0.5f, 1.0f, 0.0f),
m_nGrassClusterVBOID(0), m_nGrassClusterIndexVBOID(0), m_nGrassClusterVAOID(0)
{
m_GrassClusterInstanceArray.ensureStorageAllocated(INIT_GRASSCLUSTERINSTANCE_NUM);
// Local Grass Cluster Vertex and Index
/*
0 1
|-----------|
| |
| |
| |
|-----------|
3 2
*/
uint16 grassIndex[6*3] = { 0, 2, 1, 0, 3, 2, 4, 6, 5, 4, 7, 6, 8, 10, 9, 8, 11, 10 };
Vector3D OffsetVector(m_vDefaultGrassSize.x, 0, 0);
Matrix4x4 RotMat;
for( int i=-1; i<=1; i++ )
{
RotMat.RotationY( i * 60.0f * pi_over_180 );
OffsetVector.RotateWith(RotMat);
if( i == 0 )
OffsetVector.Set(m_vDefaultGrassSize.x, 0, 0);
m_grassVertex[(i+1)*4 + 0].x = -OffsetVector.x;
m_grassVertex[(i+1)*4 + 0].y = -OffsetVector.y;
m_grassVertex[(i+1)*4 + 0].z = -OffsetVector.z;
m_grassVertex[(i+1)*4 + 0].tu = 0; m_grassVertex[(i+1)*4 + 0].tv = 0;
m_grassVertex[(i+1)*4 + 1].x = OffsetVector.x;
m_grassVertex[(i+1)*4 + 1].y = OffsetVector.y;
m_grassVertex[(i+1)*4 + 1].z = OffsetVector.z;
m_grassVertex[(i+1)*4 + 1].tu = 1; m_grassVertex[(i+1)*4 + 1].tv = 0;
m_grassVertex[(i+1)*4 + 2].x = OffsetVector.x;
m_grassVertex[(i+1)*4 + 2].y = OffsetVector.y;
m_grassVertex[(i+1)*4 + 2].z = OffsetVector.z;
m_grassVertex[(i+1)*4 + 2].tu = 1; m_grassVertex[(i+1)*4 + 2].tv = 1;
m_grassVertex[(i+1)*4 + 3].x = -OffsetVector.x;
m_grassVertex[(i+1)*4 + 3].y = -OffsetVector.y;
m_grassVertex[(i+1)*4 + 3].z = -OffsetVector.z;
m_grassVertex[(i+1)*4 + 3].tu = 0; m_grassVertex[(i+1)*4 + 3].tv = 1;
}
GLsizei nStride = sizeof(SGPVertex_GRASS_GLES2);
// create one GrassCluster VAO and VBO
m_pRenderDevice->extGlGenVertexArray(1, &m_nGrassClusterVAOID);
m_pRenderDevice->extGlBindVertexArray(m_nGrassClusterVAOID);
glGenBuffers(1, &m_nGrassClusterVBOID);
glBindBuffer(GL_ARRAY_BUFFER, m_nGrassClusterVBOID);
glBufferData(GL_ARRAY_BUFFER, INIT_GRASSCLUSTERINSTANCE_NUM*4*3*nStride, NULL, GL_STREAM_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(0));
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(4*sizeof(float)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 4, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(8*sizeof(float)));
glEnableVertexAttribArray(3);
glVertexAttribPointer(3, 4, GL_FLOAT, GL_FALSE, nStride, (GLvoid *)BUFFER_OFFSET(12*sizeof(float)));
glGenBuffers(1, &m_nGrassClusterIndexVBOID);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_nGrassClusterIndexVBOID);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, INIT_GRASSCLUSTERINSTANCE_NUM*6*3*sizeof(uint16), NULL, GL_STATIC_DRAW);
uint16* pGrassIndex = (uint16*)m_pRenderDevice->extGlMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY_OES);
for( uint16 j=0; j<INIT_GRASSCLUSTERINSTANCE_NUM; j++ )
{
for( int k=0; k<6*3; k++ )
pGrassIndex[ j*(6*3) + k ] = grassIndex[k] + j*(4*3);
}
m_pRenderDevice->extGlUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
m_pRenderDevice->extGlBindVertexArray(0);
}
