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/*
* shaders.cpp
* Sludge Engine
*
* Created by Rikard Peterson on 2009-12-29.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "debug.h"
#include "stringy.h"
#include "shaders.h"
#include "graphics.h"
extern char *bundleFolder;
//Function from: http://www.evl.uic.edu/aej/594/code/ogl.cpp
//Read in a textfile (GLSL program)
// we need to pass it as a string to the GLSL driver
char *shaderFileRead(const char *name)
{
FILE *fp;
char *content = NULL;
char * fn = joinStrings (bundleFolder, name);
int count=0;
if (fn != NULL) {
fp = fopen(fn,"rt");
if (fp != NULL) {
fseek(fp, 0, SEEK_END);
count = ftell(fp);
rewind(fp);
if (count > 0) {
content = (char *)malloc(sizeof(char) * (count+1));
count = fread(content,sizeof(char),count,fp);
content[count] = '\0';
}
fclose(fp);
}
}
delete fn;
return content;
}
static void
printShaderInfoLog (GLuint shader)
{
GLint infologLength = 0;
GLint charsWritten = 0;
char *infoLog;
printOpenGLError (); // Check for OpenGL errors
glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &infologLength);
printOpenGLError (); // Check for OpenGL errors
if (infologLength > 0)
{
infoLog = new char [infologLength];
if (infoLog == NULL)
{
debugOut("ERROR: Could not allocate InfoLog buffer");
return;
}
glGetShaderInfoLog (shader, infologLength, &charsWritten, infoLog);
debugOut("Shader InfoLog:\n%s\n\n", infoLog);
delete[] infoLog;
}
printOpenGLError(); // Check for OpenGL errors
}
/* Print out the information log for a program object */
static void
printProgramInfoLog (GLuint program)
{
GLint infologLength = 0;
GLint charsWritten = 0;
char *infoLog;
printOpenGLError (); // Check for OpenGL errors
glGetProgramiv (program, GL_INFO_LOG_LENGTH, &infologLength);
printOpenGLError (); // Check for OpenGL errors
if (infologLength > 0)
{
infoLog = new char [infologLength];
if (infoLog == NULL)
{
debugOut( "ERROR: Could not allocate InfoLog buffer");
return;
}
glGetProgramInfoLog (program, infologLength, &charsWritten, infoLog);
debugOut( "Program InfoLog:\n%s\n\n", infoLog);
delete[] infoLog;
}
printOpenGLError (); // Check for OpenGL errors
}
int buildShaders (const char *vertexShader, const char *fragmentShader)
{
GLuint VS, FS, prog;
GLint vertCompiled, fragCompiled;
GLint linked;
// Create Shader Objects
VS = glCreateShader(GL_VERTEX_SHADER);
FS = glCreateShader(GL_FRAGMENT_SHADER);
// Load source code strings into shaders
glShaderSource(VS, 1, &vertexShader, NULL);
glShaderSource(FS, 1, &fragmentShader, NULL);
debugOut("Compiling vertex shader... \n");
// Compile vertex shader and print log
glCompileShader(VS);
printOpenGLError();
glGetShaderiv(VS, GL_COMPILE_STATUS, &vertCompiled);
printShaderInfoLog (VS);
debugOut("\nCompiling fragment shader... \n");
// Compile fragment shader and print log
glCompileShader(FS);
printOpenGLError();
glGetShaderiv(FS, GL_COMPILE_STATUS, &fragCompiled);
printShaderInfoLog (FS);
if (!vertCompiled || !fragCompiled)
return 0;
debugOut( "\nShaders compiled. \n");
// Create a program object and attach the two compiled shaders
prog = glCreateProgram();
glAttachShader(prog, VS);
glAttachShader(prog, FS);
// Clean up
glDeleteShader (VS);
glDeleteShader (FS);
// Link the program and print log
glLinkProgram(prog);
printOpenGLError();
glGetProgramiv(prog, GL_LINK_STATUS, &linked);
printProgramInfoLog(prog);
if (!linked)
return 0;
debugOut("Shader program linked. \n");
return prog;
}
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