void oglInit(int width, int height) { start_func
oglError("oglInit: selectVideoMode");
oglDebug(glViewport(0, 0, width, height));
oglDebug(glClearColor(0.0f, 0.0f, 0.0f, 0.0f));
oglDebug(glEnable(GL_TEXTURE_2D));
oglDebug(glDisable(GL_DEPTH_TEST));
oglDebug(glAlphaFunc(GL_GREATER, 0));
oglDebug(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
oglDebug(glDisable(GL_ALPHA_TEST));
oglDebug(glDisable(GL_BLEND));
alphaOn = 0;
blendOn = 0;
// May change later
oglDebug(glShadeModel(GL_SMOOTH));
// Change to modulate to allow coloring
oglDebug(glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE));
oglDebug(glMatrixMode(GL_PROJECTION));
oglDebug(glLoadIdentity());
oglDebug(glOrtho(0, width, height, 0, 0, 1));
oglDebug(glMatrixMode(GL_MODELVIEW));
oglError("oglInit");
// Some places optimize output and need to reset when GL is initialized
TextureMap::setupOptimizations();
}
GLuint loadShader(const char* vertexFile, const char* fragmentFile)
{
GLuint vert, frag, program;
if (oglError() != GL_NO_ERROR) /* just in case an error occurred beforehand */
printf("NOTE: GL error set before call to loadShader()\n");
/* load vertex and fragment shaders */
vert = loadShaderPart(vertexFile, GL_VERTEX_SHADER);
frag = loadShaderPart(fragmentFile, GL_FRAGMENT_SHADER);
if (!vert && !frag)
return 0;
/* create the shader program object */
program = glCreateProgram();
/* attach the shader objects to the program */
if (vert) glAttachShader(program, vert);
if (frag) glAttachShader(program, frag);
/* link the attached shader objects to create the shader executable */
glLinkProgram(program);
/* check for errors */
programError(program);
/* now it's compiled we don't need the intermediates */
if (vert) glDeleteShader(vert);
if (frag) glDeleteShader(frag);
/* return our shader program */
oglError();
return program;
}
void programError(GLuint program)
{
/* prints out detailed compile errors for given program */
#ifdef SHOW_SHADER_ERRORS
int infologLength = 0;
int charsWritten = 0;
GLchar *infoLog;
oglError();
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &infologLength);
oglError();
if (infologLength > 1)
{
infoLog = (GLchar *)malloc(infologLength);
glGetProgramInfoLog(program, infologLength, &charsWritten, infoLog);
printf("Program InfoLog:%s\n", infoLog);
free(infoLog);
}
oglError();
#endif
}
void shaderError(GLuint shader)
{
/* prints out detailed compile errors for the given shader (fragment or vertex) */
#ifdef SHOW_SHADER_ERRORS
int infologLength = 0;
int charsWritten = 0;
GLchar *infoLog;
oglError();
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infologLength);
oglError();
if (infologLength > 1)
{
infoLog = (GLchar *)malloc(infologLength);
glGetShaderInfoLog(shader, infologLength, &charsWritten, infoLog);
printf("Shader InfoLog:%s\n", infoLog);
free(infoLog);
}
oglError();
#endif
}
