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/*
* Copyright (C) 2004-2007 Andrew Mihal
*
* This file is part of Enblend.
*
* Enblend 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.
*
* Enblend 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 Enblend; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <iostream>
#include <cstdlib>
#include "gpu.h"
#ifdef HAVE_LIBGLEW
using std::cerr;
using std::cout;
using std::endl;
const std::string command;
static GLuint GlutWindowHandle;
static GLint MaxTextureSize;
static GLuint PiTexture;
static GLuint ETexture;
static GLuint OutTexture;
static GLuint FB;
static GLhandleARB ProgramObject;
static GLhandleARB ShaderObject;
static GLint PiTextureParam;
static GLint ETextureParam;
static GLint TempParam;
static GLint KMaxParam;
static const char *GDAKernelSource = {
"uniform sampler2DRect PiTexture;"
"uniform sampler2DRect ETexture;"
"uniform float Temperature;"
"uniform float KMax;"
"void main(void)"
"{"
" vec4 pix = texture2DRect(PiTexture, gl_TexCoord[0].st);"
" vec4 ex = texture2DRect(ETexture, gl_TexCoord[0].st);"
" vec4 An;"
" vec4 pi_plus;"
" vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);"
" float i = 0.0;"
" for (i = 0.0; i < KMax; i++) {"
" vec2 coord = vec2(i, gl_TexCoord[0].t);"
" An = exp((ex - texture2DRect(ETexture, coord)) / Temperature) + 1.0;"
" pi_plus = pix + texture2DRect(PiTexture, coord);"
" sum += (pi_plus / An);"
" }"
" gl_FragColor = sum / KMax;"
"}"
};
void checkGLErrors(int line, char* file) {
GLenum errCode;
if ((errCode = glGetError()) != GL_NO_ERROR) {
cerr << command
<< ": GL error in " << file << ":" << line << ": "
<< gluErrorString(errCode) << endl;
exit(1);
}
}
void printInfoLog(GLhandleARB obj) {
GLint infologLength = 0;
GLint charsWritten = 0;
char *infoLog;
glGetObjectParameterivARB(obj, GL_OBJECT_INFO_LOG_LENGTH_ARB, &infologLength);
if (infologLength > 1) {
infoLog = new char[infologLength];
glGetInfoLogARB(obj, infologLength, &charsWritten, infoLog);
cerr << command << ": info: GL info log\n" << infoLog << endl;
delete [] infoLog;
}
}
bool checkFramebufferStatus() {
GLenum status;
status = (GLenum) glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
switch(status) {
case GL_FRAMEBUFFER_COMPLETE_EXT:
return true;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
cerr << command
<< ": GL error: Framebuffer incomplete, incomplete attachment"
<< endl;
return false;
case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
cerr << command
<< ": unsupported framebuffer format"
<< endl;
return false;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
cerr << command
<< ": framebuffer incomplete, missing attachment"
<< endl;
return false;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
cerr << command
<< ": framebuffer incomplete, attached images must have same dimensions"
<< endl;
return false;
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
cerr << command
<< ": framebuffer incomplete, attached images must have same format"
<< endl;
return false;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
cerr << command
<< ": framebuffer incomplete, missing draw buffer"
<< endl;
return false;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
cerr << command
<< ": framebuffer incomplete, missing read buffer"
<< endl;
return false;
}
return false;
}
bool initGPU(int* argcp, char** argv) {
glutInit(argcp, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_ALPHA);
GlutWindowHandle = glutCreateWindow("Enblend");
const int err = glewInit();
if (err != GLEW_OK) {
cerr << command << ": an error occured while setting up the GPU\n"
<< command << ": " << glewGetErrorString(err) << "\n"
<< command << ": \"--gpu\" flag is not going to work on this machine"
<< endl;
glutDestroyWindow(GlutWindowHandle);
exit(1);
}
cerr << command << ": info: using graphics card: " << glGetString(GL_VENDOR) << "\n"
<< command << ": info: renderer: " << glGetString(GL_RENDERER)
<< endl;
const GLboolean has_arb_fragment_shader = glewGetExtension("GL_ARB_fragment_shader");
const GLboolean has_arb_vertex_shader = glewGetExtension("GL_ARB_vertex_shader");
const GLboolean has_arb_shader_objects = glewGetExtension("GL_ARB_shader_objects");
const GLboolean has_arb_shading_language = glewGetExtension("GL_ARB_shading_language_100");
if (!(has_arb_fragment_shader &&
has_arb_vertex_shader &&
has_arb_shader_objects &&
has_arb_shading_language)) {
const char* msg[] = {"false", "true"};
cerr << command << ": extension GL_ARB_fragment_shader = " << msg[has_arb_fragment_shader] << "\n"
<< command << ": extension GL_ARB_vertex_shader = " << msg[has_arb_vertex_shader] << "\n"
<< command << ": extension GL_ARB_shader_objects = " << msg[has_arb_shader_objects] << "\n"
<< command << ": extension GL_ARB_shading_language_100 = " << msg[has_arb_shading_language] << "\n"
<< command << ": graphics card lacks the necessary extensions for \"--gpu\";" << "\n"
<< command << ": \"--gpu\" flag is not going to work on this machine" << endl;
glutDestroyWindow(GlutWindowHandle);
exit(1);
}
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &MaxTextureSize);
ProgramObject = glCreateProgramObjectARB();
ShaderObject = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
glAttachObjectARB(ProgramObject, ShaderObject);
glShaderSourceARB(ShaderObject, 1, &GDAKernelSource, NULL);
glCompileShaderARB(ShaderObject);
printInfoLog(ShaderObject);
glLinkProgramARB(ProgramObject);
GLint success;
glGetObjectParameterivARB(ProgramObject, GL_OBJECT_LINK_STATUS_ARB, &success);
if (!success) {
cerr << command
<< ": GPU ARB shader program could not be linked"
<< endl;
exit(1);
}
PiTextureParam = glGetUniformLocationARB(ProgramObject, "PiTexture");
ETextureParam = glGetUniformLocationARB(ProgramObject, "ETexture");
TempParam = glGetUniformLocationARB(ProgramObject, "Temperature");
KMaxParam = glGetUniformLocationARB(ProgramObject, "KMax");
glUseProgramObjectARB(ProgramObject);
return true;
}
bool configureGPUTextures(unsigned int k, unsigned int vars) {
// state variables packed into vec4s
int height = (vars + 3) / 4;
int width = k;
glGenTextures(1, &PiTexture);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, PiTexture);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, width, height,
0, GL_RGBA, GL_FLOAT, NULL);
CHECK_GL();
glGenTextures(1, &ETexture);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, ETexture);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, width, height,
0, GL_RGBA, GL_FLOAT, NULL);
CHECK_GL();
glGenTextures(1, &OutTexture);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, OutTexture);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, width, height,
0, GL_RGBA, GL_FLOAT, NULL);
CHECK_GL();
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glGenFramebuffersEXT(1, &FB);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FB);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, width, 0.0, height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, width, height);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_ARB,
OutTexture, 0);
if (!checkFramebufferStatus()) {
exit(1);
}
return true;
}
bool gpuGDAKernel(unsigned int k, unsigned int vars, double t,
float* packedEData, float* packedPiData, float* packedOutData) {
unsigned localWidth = k;
unsigned localHeight = (vars+3) / 4;
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, PiTexture);
glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 0, 0, localWidth, localHeight,
GL_RGBA, GL_FLOAT, packedPiData);
CHECK_GL();
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, ETexture);
glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 0, 0, localWidth, localHeight,
GL_RGBA, GL_FLOAT, packedEData);
CHECK_GL();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, PiTexture);
glUniform1iARB(PiTextureParam, 0);
CHECK_GL();
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, ETexture);
glUniform1iARB(ETextureParam, 1);
CHECK_GL();
glUniform1fARB(TempParam, t);
CHECK_GL();
glUniform1fARB(KMaxParam, k);
CHECK_GL();
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
glPolygonMode(GL_FRONT, GL_FILL);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0);
glTexCoord2f(localWidth, 0.0); glVertex2f(localWidth, 0.0);
glTexCoord2f(localWidth, localHeight); glVertex2f(localWidth, localHeight);
glTexCoord2f(0.0, localHeight); glVertex2f(0.0, localHeight);
glEnd();
CHECK_GL();
glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
CHECK_GL();
glReadPixels(0, 0, localWidth, localHeight, GL_RGBA, GL_FLOAT, packedOutData);
CHECK_GL();
return true;
}
bool clearGPUTextures() {
glDeleteFramebuffersEXT(1, &FB);
glDeleteTextures(1, &PiTexture);
glDeleteTextures(1, &ETexture);
glDeleteTextures(1, &OutTexture);
return true;
}
bool wrapupGPU() {
if (FB != 0) glDeleteFramebuffersEXT(1, &FB);
if (PiTexture != 0) glDeleteTextures(1, &PiTexture);
if (ETexture != 0) glDeleteTextures(1, &ETexture);
if (OutTexture != 0) glDeleteTextures(1, &OutTexture);
glutDestroyWindow(GlutWindowHandle);
return true;
}
#endif
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