/**
* Pass a GLSL shader source to OpenGL and compile it into a usable shader object.
* Prints compilation errors (if any) to the log.
* Note that this will only compile shaders into objects, linking them into executables happens later
*
* @param shader_source GLSL sourcecode for the shader
* @param shader_type OpenGL ID for the type of shader being used, like GL_FRAGMENT_SHADER_ARB, GL_VERTEX_SHADER_ARB
* @return OpenGL handle for the compiled shader object
*/
GLhandleARB opengl_shader_compile_object(const GLcharARB *shader_source, GLenum shader_type)
{
GLhandleARB shader_object = 0;
GLint status = 0;
shader_object = vglCreateShaderObjectARB(shader_type);
vglShaderSourceARB(shader_object, 1, &shader_source, NULL);
vglCompileShaderARB(shader_object);
// check if the compile was successful
vglGetObjectParameterivARB(shader_object, GL_OBJECT_COMPILE_STATUS_ARB, &status);
opengl_shader_check_info_log(shader_object);
// we failed, bail out now...
if (status == 0) {
// basic error check
mprintf(("%s shader failed to compile:\n%s\n", (shader_type == GL_VERTEX_SHADER_ARB) ? "Vertex" : "Fragment", GLshader_info_log));
// this really shouldn't exist, but just in case
if (shader_object) {
vglDeleteObjectARB(shader_object);
}
return 0;
}
// we succeeded, maybe output warnings too
if (strlen(GLshader_info_log) > 5) {
nprintf(("SHADER-DEBUG", "%s shader compiled with warnings:\n%s\n", (shader_type == GL_VERTEX_SHADER_ARB) ? "Vertex" : "Fragment", GLshader_info_log));
}
return shader_object;
}
/**
* Pass a GLSL shader source to OpenGL and compile it into a usable shader object.
* Prints compilation errors (if any) to the log.
* Note that this will only compile shaders into objects, linking them into executables happens later
*
* @param shader_source GLSL sourcecode for the shader
* @param shader_type OpenGL ID for the type of shader being used, like GL_FRAGMENT_SHADER_ARB, GL_VERTEX_SHADER_ARB
* @return OpenGL handle for the compiled shader object
*/
GLhandleARB opengl_shader_compile_object(const SCP_vector<SCP_string>& shader_source, GLenum shader_type)
{
GLhandleARB shader_object = 0;
GLint status = 0;
SCP_vector<const GLcharARB*> sources;
sources.reserve(shader_source.size());
for (auto it = shader_source.begin(); it != shader_source.end(); ++it) {
sources.push_back(it->c_str());
}
shader_object = vglCreateShaderObjectARB(shader_type);
vglShaderSourceARB(shader_object, sources.size(), &sources[0], NULL);
vglCompileShaderARB(shader_object);
// check if the compile was successful
vglGetObjectParameterivARB(shader_object, GL_OBJECT_COMPILE_STATUS_ARB, &status);
opengl_shader_check_info_log(shader_object);
// we failed, bail out now...
if (status == 0) {
// basic error check
mprintf(("%s shader failed to compile:\n%s\n", (shader_type == GL_VERTEX_SHADER_ARB) ? "Vertex" : ((shader_type == GL_GEOMETRY_SHADER_EXT) ? "Geometry" : "Fragment"), GLshader_info_log));
// this really shouldn't exist, but just in case
if (shader_object) {
vglDeleteObjectARB(shader_object);
}
return 0;
}
// we succeeded, maybe output warnings too
if (strlen(GLshader_info_log) > 5) {
nprintf(("SHADER-DEBUG", "%s shader compiled with warnings:\n%s\n", (shader_type == GL_VERTEX_SHADER_ARB) ? "Vertex" : ((shader_type == GL_GEOMETRY_SHADER_EXT) ? "Geometry" : "Fragment"), GLshader_info_log));
}
return shader_object;
}
