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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "allfiles.h"
#include "debug.h"
#include "stringy.h"
#include "shaders.h"
#include "graphics.h"
namespace Sludge {
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;
#if 0
printOpenGLError(); // Check for OpenGL errors
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infologLength);
printOpenGLError(); // Check for OpenGL errors
#endif
if (infologLength > 0) {
infoLog = new char [infologLength];
if (infoLog == NULL) {
debugOut("ERROR: Could not allocate InfoLog buffer");
return;
}
#if 0
glGetShaderInfoLog(shader, infologLength, &charsWritten, infoLog);
debugOut("Shader InfoLog:\n%s\n\n", infoLog);
#endif
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;
#if 0
printOpenGLError(); // Check for OpenGL errors
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &infologLength);
printOpenGLError(); // Check for OpenGL errors
#endif
if (infologLength > 0) {
infoLog = new char [infologLength];
if (infoLog == NULL) {
debugOut("ERROR: Could not allocate InfoLog buffer");
return;
}
#if 0
glGetProgramInfoLog(program, infologLength, &charsWritten, infoLog);
debugOut("Program InfoLog:\n%s\n\n", infoLog);
#endif
delete[] infoLog;
}
printOpenGLError(); // Check for OpenGL errors
}
int buildShaders(const char *vertexShader, const char *fragmentShader) {
GLuint VS, FS, prog;
GLint vertCompiled, fragCompiled;
GLint linked;
#if 0
// 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);
#endif
debugOut("Compiling vertex shader... \n");
#if 0
// Compile vertex shader and print log
glCompileShader(VS);
printOpenGLError();
glGetShaderiv(VS, GL_COMPILE_STATUS, &vertCompiled);
printShaderInfoLog(VS);
#endif
debugOut("\nCompiling fragment shader... \n");
#if 0
// Compile fragment shader and print log
glCompileShader(FS);
printOpenGLError();
glGetShaderiv(FS, GL_COMPILE_STATUS, &fragCompiled);
printShaderInfoLog(FS);
#endif
if (!vertCompiled || !fragCompiled)
return 0;
debugOut("\nShaders compiled. \n");
#if 0
// 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);
#endif
if (!linked)
return 0;
debugOut("Shader program linked. \n");
return prog;
}
} // End of namespace Sludge
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