mirror of
https://github.com/outbackdingo/UltraGrid.git
synced 2026-03-20 14:40:10 +00:00
264 lines
6.7 KiB
C++
264 lines
6.7 KiB
C++
/******************************************************************************
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* a DXT viewing utility
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*
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* Author : Robert Kooima
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*
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* Copyright (C) 2007 Electronic Visualization Laboratory,
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* University of Illinois at Chicago
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either Version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser Public License along
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* with this library; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*****************************************************************************/
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#include <SDL/SDL.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#if !defined(WIN32)
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#include <unistd.h>
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#include <sys/mman.h>
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#endif
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#define MAXSTR 256
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#include "dxt.h"
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#include "glsl.h"
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#ifdef __APPLE__
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#include <OpenGL/gl.h>
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#endif
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#ifdef __linux__
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <GL/glext.h>
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#define glGetProcAddress(n) glXGetProcAddressARB((GLubyte *) n)
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#include <GL/gl.h>
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#include "glext.h"
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#define glGetProcAddress(n) wglGetProcAddress(n)
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#endif
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/*---------------------------------------------------------------------------*/
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#ifndef GLSL_YCOCG
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#ifndef __APPLE__
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static PFNGLGETCOMPRESSEDTEXIMAGEARBPROC glGetCompressedTexImage;
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static PFNGLCOMPRESSEDTEXIMAGE2DARBPROC glCompressedTexImage2D;
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#endif
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#endif
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static void init_gl(void)
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{
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#ifndef __APPLE__
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glGetCompressedTexImage = (PFNGLGETCOMPRESSEDTEXIMAGEARBPROC)
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glGetProcAddress("glGetCompressedTexImageARB");
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glCompressedTexImage2D = (PFNGLCOMPRESSEDTEXIMAGE2DARBPROC)
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glGetProcAddress("glCompressedTexImage2DARB");
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#endif
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glEnable(GL_TEXTURE_2D);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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}
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/*---------------------------------------------------------------------------*/
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static void in_dxt(int w, int h, int format, const char *name)
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{
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FILE *fin = NULL;
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static int first = 1;
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if ((fin = fopen(name, "rb")))
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{
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GLubyte *p;
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GLsizei sz;
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if (format == 5 || format == 6)
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sz = 4 * w * h / 4;
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else
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sz = 8 * (w / 4) * (h / 4);
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if ((p = (GLubyte *) malloc(sz)))
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{
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int ww, hh;
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fread( &ww, sizeof( int ), 1, fin );
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fread( &hh, sizeof( int ), 1, fin );
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fread(p, 1, sz, fin);
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if (format == 5 || format == 6)
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glCompressedTexImage2D(GL_TEXTURE_2D, 0,
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GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
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w, h, 0, sz, p);
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else
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glCompressedTexImage2D(GL_TEXTURE_2D, 0,
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GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
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w, h, 0, sz, p);
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free(p);
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}
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fclose(fin);
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}
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else perror("fopen");
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}
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/*---------------------------------------------------------------------------*/
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static void display(int w, int h)
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{
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(0, w, 0, h, 0, 1);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glClearColor(0,1,0,1);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glBegin(GL_POLYGON);
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{
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glTexCoord2i(0, 1); glVertex2i(-1, -1);
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glTexCoord2i(1, 1); glVertex2i(+1, -1);
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glTexCoord2i(1, 0); glVertex2i(+1, +1);
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glTexCoord2i(0, 0); glVertex2i(-1, +1);
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}
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glEnd();
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glFinish();
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SDL_GL_SwapBuffers();
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}
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/*---------------------------------------------------------------------------*/
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#ifdef __APPLE__
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#undef main
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#endif /* __APPLE__ */
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int main(int argc, char *argv[])
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{
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int w = 1024;
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int h = 512;
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int format = 1; // DXT1 or DXT5 or DXT5YCoCg (6)
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int out = 0;
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int argi;
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/* Process arguments. */
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for (argi = 1; argi < argc; ++argi)
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if (strcmp(argv[argi], "-5") == 0) format = 5;
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else if (strcmp(argv[argi], "-6") == 0) format = 6;
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else if (strcmp(argv[argi], "-1") == 0) format = 1;
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else if (strcmp(argv[argi], "-w") == 0) w = atoi(argv[++argi]);
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else if (strcmp(argv[argi], "-h") == 0) h = atoi(argv[++argi]);
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else break;
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/* Use SDL to get an OpenGL context for use as compressor/decompressor. */
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if (SDL_Init(SDL_INIT_VIDEO) == 0)
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{
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//SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
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//SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
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//SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
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//SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
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//SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
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if (SDL_SetVideoMode(w, h, 0, SDL_OPENGL))
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{
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SDL_Event e;
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init_gl();
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/* Convert and display named files. */
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#if defined(GLSL_YCOCG)
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// Initialize the "OpenGL Extension Wrangler" library
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glewInit();
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if (!glewIsSupported("GL_VERSION_2_0 "
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"GL_ARB_vertex_program "
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"GL_ARB_fragment_program "
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"GL_ARB_texture_compression "
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"GL_EXT_texture_compression_s3tc "
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)
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) {
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fprintf(stderr, "GLSL_YCOCG> Unable to load required OpenGL extension\n");
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exit(-1);
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}
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// Load the shaders
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GLchar *FragmentShaderSource;
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GLchar *VertexShaderSource;
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GLSLreadShaderSource("ycocg", &VertexShaderSource, &FragmentShaderSource);
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PHandle = GLSLinstallShaders(VertexShaderSource, FragmentShaderSource);
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/* Finally, use the program. */
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glUseProgramObjectARB(PHandle);
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glUseProgramObjectARB(0);
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#endif
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#if defined(GLSL_YCOCG)
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if (format == 6)
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{
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glUseProgramObjectARB(PHandle);
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glActiveTexture(GL_TEXTURE0);
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int h=glGetUniformLocationARB(PHandle,"yuvtex");
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glUniform1iARB(h,0); /* Bind yuvtex to texture unit 0 */
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}
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#endif
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for (; argi < argc; ++argi)
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{
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in_dxt(w, h, format, argv[argi]);
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display(w, h);
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while (SDL_PollEvent(&e))
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if (e.type == SDL_QUIT || e.type == SDL_KEYDOWN)
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break;
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}
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#if defined(GLSL_YCOCG)
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if (format == 6)
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glUseProgramObjectARB(0);
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#endif
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while (SDL_WaitEvent(&e))
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if (e.type == SDL_QUIT || e.type == SDL_KEYDOWN)
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break;
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}
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else fprintf(stderr, "SDL_SetVideoMode: %s\n", SDL_GetError());
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SDL_Quit();
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}
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else fprintf(stderr, "SDL_Init: %s\n", SDL_GetError());
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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