void Raycaster::glRenderAction(GLContextData& contextData) const
{
/* Get the OpenGL-dependent application data from the GLContextData object: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Save OpenGL state: */
glPushAttrib(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_ENABLE_BIT|GL_LIGHTING_BIT|GL_POLYGON_BIT);
/* Initialize the ray termination depth frame buffer: */
dataItem->initDepthBuffer();
/* Bind the ray termination framebuffer: */
GLint currentFramebuffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT,¤tFramebuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->depthFramebufferID);
/* Get the projection and modelview matrices: */
PTransform mv=glGetModelviewMatrix<Scalar>();
PTransform pmv=glGetProjectionMatrix<Scalar>();
pmv*=mv;
/* Clip the render domain against the view frustum's front plane and all clipping planes: */
Polyhedron<Scalar>* clippedDomain=clipDomain(pmv,mv);
/* Draw the clipped domain's back faces to the depth buffer as ray termination conditions: */
glEnable(GL_CULL_FACE);
glCullFace(GL_FRONT);
clippedDomain->drawFaces();
/* Unbind the depth framebuffer: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,currentFramebuffer);
/* Install the GLSL shader program: */
dataItem->shader.useProgram();
bindShader(pmv,mv,dataItem);
/* Draw the clipped domain's front faces: */
glEnable(GL_BLEND);
glBlendFunc(GL_ONE,GL_ONE_MINUS_SRC_ALPHA);
glDepthMask(GL_FALSE);
glCullFace(GL_BACK);
if(clippedDomain!=0)
clippedDomain->drawFaces();
/* Uninstall the GLSL shader program: */
unbindShader(dataItem);
GLShader::disablePrograms();
/* Clean up: */
delete clippedDomain;
/* Restore OpenGL state: */
glPopAttrib();
}
void TextureShader::compile() {
Shader::compile();
bindShader();
texCoordAttributeHandle = glGetAttribLocation(program, "a_texCoord");
if (texCoordAttributeHandle < 0) {
LOGE("*** Couldn't get shader's a_texCoord location.");
ABORT_GAME;
}
samplerHandle = glGetUniformLocation(program, "s_texture");
if (samplerHandle < 0) {
LOGE("*** Couldn't get shader's s_texture location.");
ABORT_GAME;
}
unbindShader();
}
