JNIEXPORT void JNICALL Java_org_lwjgl_opengl_EXTVertexShader_nglBeginVertexShaderEXT(JNIEnv *env, jclass clazz, jlong function_pointer) {
glBeginVertexShaderEXTPROC glBeginVertexShaderEXT = (glBeginVertexShaderEXTPROC)((intptr_t)function_pointer);
glBeginVertexShaderEXT();
}
void pnTriangles::bindVertexProgram(const MColor diffuse,
const MColor specular,
const MColor emission,
const MColor ambient)
//
// Description:
// Sample vertex program which sets up a yellow diffuse
// shader.
//
{
// See if extension is supported
//
if (!fExtensionSupported[kVertexShaderEXT])
return;
// Enable vertex shaders
glEnable(GL_VERTEX_SHADER_EXT);
// Generate a new vertex shader id, if none has been created.
if (fVertexShaderId != -1)
{
glBindVertexShaderEXT (fVertexShaderId);
return;
}
fVertexShaderId = glGenVertexShadersEXT (1);
//Initialize global parameter bindings
GLuint Modelview = glBindParameterEXT (GL_MODELVIEW_MATRIX);
GLuint Projection = glBindParameterEXT (GL_PROJECTION_MATRIX);
// Q: does this read properly from vertex arrays or
// do I need to define a variant pointer via glVariantPointerEXT ?
//
GLuint Vertex = glBindParameterEXT (GL_CURRENT_VERTEX_EXT);
// GL_CURRENT_NORMAL comes from the glGetPointerTarget enums
GLuint Normal = glBindParameterEXT (GL_CURRENT_NORMAL);
//GLuint lightPos = glBindLightParameterEXT( 0, GL_POSITION );
// Bind a diffuse shader
glBindVertexShaderEXT (fVertexShaderId);
glBeginVertexShaderEXT ();
{
float direction[4] = { 0.57735f, 0.57735f, 0.57735f, 0.0f}; //direction vector (1,1,1) normalized
GLuint lightDirection;
GLuint diffMaterial;
GLuint sceneAmbient;
GLuint eyeVertex;
GLuint clipVertex;
GLuint eyeNormal;
GLuint intensity;
// generate local values
eyeVertex = glGenSymbolsEXT (GL_VECTOR_EXT, GL_LOCAL_EXT, GL_FULL_RANGE_EXT, 1);
clipVertex = glGenSymbolsEXT (GL_VECTOR_EXT, GL_LOCAL_EXT, GL_FULL_RANGE_EXT, 1);
eyeNormal = glGenSymbolsEXT (GL_VECTOR_EXT, GL_LOCAL_EXT, GL_FULL_RANGE_EXT, 1);
intensity = glGenSymbolsEXT (GL_VECTOR_EXT, GL_LOCAL_EXT, GL_FULL_RANGE_EXT, 1);
// generate constant values
lightDirection = glGenSymbolsEXT (GL_VECTOR_EXT, GL_LOCAL_CONSTANT_EXT, GL_FULL_RANGE_EXT, 1);
diffMaterial = glGenSymbolsEXT (GL_VECTOR_EXT, GL_LOCAL_CONSTANT_EXT, GL_FULL_RANGE_EXT, 1);
sceneAmbient = glGenSymbolsEXT (GL_VECTOR_EXT, GL_LOCAL_CONSTANT_EXT, GL_FULL_RANGE_EXT, 1);
glSetLocalConstantEXT (lightDirection, GL_FLOAT, direction);
glSetLocalConstantEXT (diffMaterial, GL_FLOAT, (void *)&(diffuse.r));
glSetLocalConstantEXT (sceneAmbient, GL_FLOAT, (void *)&(ambient.r));
glShaderOp2EXT (GL_OP_MULTIPLY_MATRIX_EXT, eyeVertex, Modelview, Vertex);
glShaderOp2EXT (GL_OP_MULTIPLY_MATRIX_EXT, GL_OUTPUT_VERTEX_EXT, Projection, eyeVertex);
// assumes no scaling/shearing in modelview matrix
glShaderOp2EXT (GL_OP_MULTIPLY_MATRIX_EXT, eyeNormal, Modelview, Normal);
glShaderOp2EXT (GL_OP_DOT3_EXT, intensity, lightDirection, eyeNormal);
glShaderOp2EXT (GL_OP_ADD_EXT, intensity, sceneAmbient, intensity);
glShaderOp2EXT (GL_OP_MUL_EXT, GL_OUTPUT_COLOR0_EXT, diffMaterial, intensity);
}
glEndVertexShaderEXT ();
}
