// #### bindProgram
//
// Do all the work to build and install shader including
// set up buffer blocks for uniform variables, set up
// default lighting parameters, pass material uniforms
// and bind texture buffers used by texture maps and by
// OpenSubdiv's built-in shading code.
//
GLuint
OpenSubdivShader::bindProgram(const MHWRender::MDrawContext & mDrawContext,
OpenSubdiv::OsdGLDrawContext *osdDrawContext,
const OpenSubdiv::OsdDrawContext::PatchArray & patch)
{
CHECK_GL_ERROR("bindProgram begin\n");
// Primitives are triangles for Loop subdivision, quads otherwise
Effect effect = kFill;
EffectDesc effectDesc( patch.GetDescriptor(), effect );
// Build shader
EffectDrawRegistry::ConfigType *
config = g_effectRegistry.GetDrawConfig(effectDesc);
// Install shader
GLuint program = config->program;
glUseProgram(program);
// Update and bind transform state
struct Transform {
float ModelViewMatrix[16];
float ProjectionMatrix[16];
float ModelViewProjectionMatrix[16];
} transformData;
setMatrix(mDrawContext.getMatrix(MHWRender::MDrawContext::kWorldViewMtx),
transformData.ModelViewMatrix);
setMatrix(mDrawContext.getMatrix(MHWRender::MDrawContext::kProjectionMtx),
transformData.ProjectionMatrix);
setMatrix(mDrawContext.getMatrix(MHWRender::MDrawContext::kWorldViewProjMtx),
transformData.ModelViewProjectionMatrix);
if (!g_transformUB) {
glGenBuffers(1, &g_transformUB);
glBindBuffer(GL_UNIFORM_BUFFER, g_transformUB);
glBufferData(GL_UNIFORM_BUFFER,
sizeof(transformData), NULL, GL_STATIC_DRAW);
};
glBindBuffer(GL_UNIFORM_BUFFER, g_transformUB);
glBufferSubData(GL_UNIFORM_BUFFER,
0, sizeof(transformData), &transformData);
glBindBuffer(GL_UNIFORM_BUFFER, 0);
glBindBufferBase(GL_UNIFORM_BUFFER, g_transformBinding, g_transformUB);
// Update and bind tessellation state
struct Tessellation {
float TessLevel;
} tessellationData;
tessellationData.TessLevel = static_cast<float>(1 << _tessFactor);
if (!g_tessellationUB) {
glGenBuffers(1, &g_tessellationUB);
glBindBuffer(GL_UNIFORM_BUFFER, g_tessellationUB);
glBufferData(GL_UNIFORM_BUFFER,
sizeof(tessellationData), NULL, GL_STATIC_DRAW);
};
glBindBuffer(GL_UNIFORM_BUFFER, g_tessellationUB);
glBufferSubData(GL_UNIFORM_BUFFER,
0, sizeof(tessellationData), &tessellationData);
glBindBuffer(GL_UNIFORM_BUFFER, 0);
glBindBufferBase(GL_UNIFORM_BUFFER,
g_tessellationBinding,
g_tessellationUB);
// Update and bind lighting state
int numLights = mDrawContext.numberOfActiveLights();
struct Lighting {
struct Light {
float position[4];
float diffuse[4];
float ambient[4];
float specular[4];
} lightSource[2];
} lightingData;
memset(&lightingData, 0, sizeof(lightingData));
for (int i = 0; i < numLights && i < 2; ++i) {
MFloatPointArray positions;
MFloatVector direction;
float intensity;
MColor color;
bool hasDirection, hasPosition;
mDrawContext.getLightInformation(i, positions, direction, intensity,
color, hasDirection, hasPosition);
MMatrix modelView = mDrawContext.getMatrix(MHWRender::MDrawContext::kWorldViewMtx);
direction = MVector(direction) * modelView;
Lighting::Light &light = lightingData.lightSource[i];
if (hasDirection) {
light.position[0] = -direction[0];
light.position[1] = -direction[1];
light.position[2] = -direction[2];
for (int j = 0; j < 4; ++j) {
light.diffuse[j] = color[j] * intensity;
light.ambient[j] = color[j] * intensity;
light.specular[j] = color[j] * intensity;
}
}
}
if (!g_lightingUB) {
glGenBuffers(1, &g_lightingUB);
glBindBuffer(GL_UNIFORM_BUFFER, g_lightingUB);
glBufferData(GL_UNIFORM_BUFFER,
sizeof(lightingData), NULL, GL_STATIC_DRAW);
};
glBindBuffer(GL_UNIFORM_BUFFER, g_lightingUB);
glBufferSubData(GL_UNIFORM_BUFFER,
0, sizeof(lightingData), &lightingData);
glBindBuffer(GL_UNIFORM_BUFFER, 0);
glBindBufferBase(GL_UNIFORM_BUFFER, g_lightingBinding, g_lightingUB);
// Update other uniforms
float color[4] = { 0, 0, 0, 1 };
_diffuse.get(color);
glProgramUniform4fv(program,
glGetUniformLocation(program, "diffuseColor"),
1, color);
_ambient.get(color);
glProgramUniform4fv(program,
glGetUniformLocation(program, "ambientColor"),
1, color);
_specular.get(color);
glProgramUniform4fv(program,
glGetUniformLocation(program, "specularColor"),
1, color);
glProgramUniform1f(program,
glGetUniformLocation(program, "shininess"),
_shininess);
// Bind diffuse map
if (g_effectRegistry.getDiffuseId()!=0) {
GLint difmap = glGetUniformLocation(program, "diffuseMap");
glProgramUniform1i(program, difmap, DIFF_TEXTURE_UNIT);
}
// Bind all texture buffers
// OpenSubdiv's geometric shading code depends on additional
// GL texture buffers. These are managed by the DrawContext
// and must be bound for use by the program in addition to
// any buffers used by the client/application shading code.
if (osdDrawContext->GetVertexTextureBuffer()) {
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_BUFFER,
osdDrawContext->GetVertexTextureBuffer());
}
if (osdDrawContext->GetVertexValenceTextureBuffer()) {
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_BUFFER,
osdDrawContext->GetVertexValenceTextureBuffer());
}
if (osdDrawContext->GetQuadOffsetsTextureBuffer()) {
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_BUFFER,
osdDrawContext->GetQuadOffsetsTextureBuffer());
}
if (osdDrawContext->GetPatchParamTextureBuffer()) {
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_BUFFER,
osdDrawContext->GetPatchParamTextureBuffer());
}
if (osdDrawContext->GetFvarDataTextureBuffer()) {
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_BUFFER,
osdDrawContext->GetFvarDataTextureBuffer() );
}
glActiveTexture(GL_TEXTURE0);
CHECK_GL_ERROR("bindProgram leave\n");
return program;
}
void
MyDrawDelegate::DrawElements(OpenSubdiv::OsdDrawContext::PatchArray const &patchArray) {
// bind patchType-wise effect state
// can be skipped (if config is not changed)
MyDrawConfig *config = GetDrawConfig(_currentEffect, patchArray.GetDescriptor());
GLuint program = config->program;
if (true /* if config is different from previous call */) {
glUseProgram(program);
#if defined(GL_ARB_tessellation_shader) || defined(GL_VERSION_4_0)
glPatchParameteri(GL_PATCH_VERTICES, patchArray.GetDescriptor().GetNumControlVertices());
#endif
// bind patchArray state and draw
}
// apply patch color
_currentEffect->BindDrawConfig(config, patchArray.GetDescriptor());
glUniform1i(config->primitiveIdBaseUniform, patchArray.GetPatchIndex());
if (patchArray.GetDescriptor().GetType() == OpenSubdiv::FarPatchTables::GREGORY ||
patchArray.GetDescriptor().GetType() == OpenSubdiv::FarPatchTables::GREGORY_BOUNDARY){
glUniform1i(config->gregoryQuadOffsetBaseUniform, patchArray.GetQuadOffsetIndex());
}
if (patchArray.GetDescriptor().GetType() == OpenSubdiv::FarPatchTables::QUADS) {
glDrawElements(GL_LINES_ADJACENCY, patchArray.GetNumIndices(), GL_UNSIGNED_INT,
(void*)(patchArray.GetVertIndex()*sizeof(GLuint)));
} else if (patchArray.GetDescriptor().GetType() == OpenSubdiv::FarPatchTables::TRIANGLES) {
glDrawElements(GL_TRIANGLES, patchArray.GetNumIndices(), GL_UNSIGNED_INT,
(void*)(patchArray.GetVertIndex()*sizeof(GLuint)));
} else {
#if defined(GL_ARB_tessellation_shader) || defined(GL_VERSION_4_0)
glDrawElements(GL_PATCHES, patchArray.GetNumIndices(), GL_UNSIGNED_INT,
(void*)(patchArray.GetVertIndex()*sizeof(GLuint)));
#endif
}
_numDrawCalls++;
}