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https://github.com/libretro/scummvm.git
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366 lines
10 KiB
C
366 lines
10 KiB
C
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001 Ludvig Strigeus
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* Copyright (C) 2001/2002 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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/* FrameBuffer renderer in an OpenGL texture
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Andre Souza <asouza@olinux.com.br> */
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#include <SDL.h>
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#include <SDL_opengl.h>
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#include <stdlib.h>
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#include <string.h>
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/* FLAGS */
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#define FB2GL_FS 1 /* FULLSCREEN */
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#define FB2GL_RGBA 2 /* Use RGBA (else use palette) */
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#define FB2GL_320 4 /* 320x256 texture (else use 256x256) */
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#define FB2GL_AUDIO 8 /* Activate SDL Audio */
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#define FB2GL_PITCH 16 /* On fb2l_update, use pitch (else bytes per pixel) */
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#define FB2GL_EXPAND 32 /* Create a RGB fb with the color lookup table*/
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/* Framebuffer for 8 bpp */
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unsigned char ogl_fb[256][256];
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unsigned char ogl_fbb[256][64];
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/* Framebuffer for RGBA */
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unsigned char ogl_fb1[256][256][4];
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unsigned char ogl_fb2[256][64][4];
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/* Texture(s) */
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GLuint texture;
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GLuint textureb;
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/* Display list */
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GLuint dlist;
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/* Color Table (256 colors, RGB) */
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char ogl_ctable[256][3];
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char ogl_temp_ctable[256][3]; /* Support for OpenGL 1.1 */
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/* Use RGBA? */
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char fb2gl_RGBA=0;
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/* If so, expand the 8 bit fb to RGB? */
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char fb2gl_expand=0;
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/* 320x256? */
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char fb2gl_t320=0;
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/* Use pitch? Else, bytes per pixel */
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char use_pitch=0;
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/* Methods */
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void fb2gl_maketex();
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void fb2gl_makedlist(int xf, int yf);
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void fb2gl_display();
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/* Public */
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SDL_Surface *screen;
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void fb2gl_init(int width, int height, int xfix, int yfix, char flags);
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void fb2gl_update(void *fb, int width, int height, int pitch, int xskip, int yskip);
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void fb2gl_palette(int index, int r, int g, int b);
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void fb2gl_set_palette(int first, int ncolors);
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void fb2gl_maketex()
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{
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glGenTextures(0,&texture);
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glBindTexture(GL_TEXTURE_2D,texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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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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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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*/
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if (fb2gl_RGBA) {
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glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,256,256,0,GL_RGBA, GL_UNSIGNED_BYTE, ogl_fb1);
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}
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else {
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glTexImage2D(GL_TEXTURE_2D,0,GL_COLOR_INDEX,256,256,0,GL_COLOR_INDEX, GL_UNSIGNED_BYTE, ogl_fb);
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}
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if (fb2gl_t320) {
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glGenTextures(1,&textureb);
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glBindTexture(GL_TEXTURE_2D,textureb);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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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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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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*/
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if (fb2gl_RGBA) {
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glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,64,256,0,GL_RGBA,
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GL_UNSIGNED_BYTE, ogl_fb2);
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}
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else {
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glTexImage2D(GL_TEXTURE_2D,0,GL_COLOR_INDEX,64,256,0,GL_COLOR_INDEX,
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GL_UNSIGNED_BYTE, ogl_fbb);
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}
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}
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}
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void fb2gl_makedlist(int xf, int yf)
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{
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double xfix=(double)xf/128; /* 128 = 256/2 (half texture => 0.0 to 1.0) */
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double yfix=(double)yf/128;
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double texend = (double)615/1024; /* End of 256x256 (from -1.0 to 1.0) */
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dlist=glGenLists(1);
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glNewList(dlist,GL_COMPILE);
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, texture);
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if (!fb2gl_t320) { /* Normal 256x256 */
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glBegin(GL_QUADS);
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glTexCoord2f(0.0,1.0); glVertex2f(-1.0,-1.0-yfix); /* upper left */
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glTexCoord2f(0.0,0.0); glVertex2f(-1.0,1.0); /* lower left */
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glTexCoord2f(1.0,0.0); glVertex2f(1.0+xfix,1.0); /* lower right */
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glTexCoord2f(1.0,1.0); glVertex2f(1.0+xfix,-1.0-yfix); /* upper right */
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glEnd();
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}
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else { /* 320x256 */
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/* First, the 256x256 texture */
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glBegin(GL_QUADS);
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glTexCoord2f(0.0,1.0); glVertex2f(-1.0,-1.0-yfix); /* upper left */
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glTexCoord2f(0.0,0.0); glVertex2f(-1.0,1.0); /* lower left */
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glTexCoord2f(1.0,0.0); glVertex2f(texend+xfix,1.0); /* lower right */
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glTexCoord2f(1.0,1.0); glVertex2f(texend+xfix,-1.0-yfix); /* upper right*/
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glEnd();
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/* 64x256 */
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glBindTexture(GL_TEXTURE_2D, textureb);
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glBegin(GL_QUADS);
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glTexCoord2f(0.0,1.0); glVertex2f(texend+xfix,-1.0-yfix); /* upper left */
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glTexCoord2f(0.0,0.0); glVertex2f(texend+xfix,1.0); /* lower left */
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glTexCoord2f(1.0,0.0); glVertex2f(1.0+xfix,1.0); /* lower right */
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glTexCoord2f(1.0,1.0); glVertex2f(1.0+xfix,-1.0-yfix); /* upper right */
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glEnd();
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}
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glDisable(GL_TEXTURE_2D);
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glEndList();
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}
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void fb2gl_init(int width, int height, int xfix, int yfix, char flags)
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{
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char fs=0;
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char audio=0;
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char gl_ext[4096];
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/* Test the flags */
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if (flags & FB2GL_FS) fs=1; else fs=0;
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if (flags & FB2GL_RGBA) fb2gl_RGBA=1; else fb2gl_RGBA=0;
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if (flags & FB2GL_320) fb2gl_t320=1; else fb2gl_t320=0;
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if (flags & FB2GL_AUDIO) audio=1; else audio=0;
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if (flags & FB2GL_PITCH) use_pitch=1; else use_pitch=0;
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if (flags & FB2GL_EXPAND) fb2gl_expand=1; else fb2gl_expand=0;
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/*
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if (audio) SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
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else SDL_Init(SDL_INIT_VIDEO);
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atexit(SDL_Quit);
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*/
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if (fs) {
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screen = SDL_SetVideoMode(width, height, 0, SDL_HWSURFACE | SDL_OPENGL | SDL_GL_DOUBLEBUFFER | SDL_FULLSCREEN);
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}
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else {
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screen = SDL_SetVideoMode(width, height, 0, SDL_HWPALETTE | SDL_HWSURFACE | SDL_OPENGL | SDL_GL_DOUBLEBUFFER);
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}
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if (!screen) {
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fprintf(stderr, "Couldn't start video res %dx%d\n", width, height);
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}
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#ifndef OGL_1_1
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if (!fb2gl_RGBA) {
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/* Paletted Texture Extension */
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strcpy(gl_ext, (char *)glGetString(GL_EXTENSIONS));
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if ( strstr( gl_ext , "GL_EXT_paletted_texture") )
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glEnable(GL_EXT_paletted_texture);
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else {
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fprintf(stderr,"Your OpenGL version doesn't support paletted texture\n");
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exit(0);
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}
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}
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#endif
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fb2gl_maketex();
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fb2gl_makedlist(xfix, yfix);
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}
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void fb2gl_display()
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{
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glCallList(dlist);
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SDL_GL_SwapBuffers();
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}
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/* Changed the way xskip and yskip work for use with scummvm (shaking) */
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void fb2gl_update(void *fb, int w, int h, int pitch, int xskip, int yskip) {
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unsigned char *fb1=(unsigned char *)fb;
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int x,y,scr_pitch,byte=0;
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if (use_pitch) scr_pitch=pitch;
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else {
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scr_pitch=w*pitch;
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byte = pitch; /* Bytes perl pixel (for RGBA mode) */
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}
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if (fb2gl_RGBA) {
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if (fb2gl_expand) { /* Expand the 8 bit fb into a RGB fb */
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for (y=yskip; y<h; y++) {
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for (x=xskip; x<w; x++) {
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if (x<256) {
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ogl_fb1[y][x][0] = ogl_ctable[*(fb1+x)][0];
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ogl_fb1[y][x][1] = ogl_ctable[*(fb1+x)][1];
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ogl_fb1[y][x][2] = ogl_ctable[*(fb1+x)][2];
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/* ogl_fb1[y-yskip][x-xskip][3]=255; */
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}
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else {
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ogl_fb2[y][x-256][0] = ogl_ctable[*(fb1+x)][0];
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ogl_fb2[y][x-256][1] = ogl_ctable[*(fb1+x)][1];
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ogl_fb2[y][x-256][2] = ogl_ctable[*(fb1+x)][2];
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/* ogl_fb2[y-yskip][x-256][3]=255; */
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}
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}
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fb1 += scr_pitch;
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}
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}
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else { /* No expansion */
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for (y=yskip; y<h; y++) {
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for (x=xskip; x<w; x++) {
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if (x<256) {
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ogl_fb1[y-yskip][x-xskip][0] = *(fb1+(x*byte));
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ogl_fb1[y-yskip][x-xskip][1] = *(fb1+(x*byte)+1);
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ogl_fb1[y-yskip][x-xskip][2] = *(fb1+(x*byte)+2);
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/* ogl_fb1[y-yskip][x-xskip][3]=255; */
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}
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else {
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ogl_fb2[y-yskip][x-256][0] = *(fb1+(x*byte));
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ogl_fb2[y-yskip][x-256][1] = *(fb1+(x*byte)+1);
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ogl_fb2[y-yskip][x-256][2] = *(fb1+(x*byte)+2);
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/* ogl_fb2[y-yskip][x-256][3]=255; */
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}
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}
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fb1 += scr_pitch;
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}
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}
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/* Update 256x256 texture */
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glBindTexture(GL_TEXTURE_2D,texture);
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glFlush();
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glTexSubImage2D(GL_TEXTURE_2D,0,xskip,yskip,256-xskip,256-yskip,GL_RGBA,
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GL_UNSIGNED_BYTE,ogl_fb1);
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if (fb2gl_t320) {
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/* Update 64x256 texture */
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glBindTexture(GL_TEXTURE_2D,textureb);
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glFlush();
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glTexSubImage2D(GL_TEXTURE_2D,0,xskip,yskip,64-xskip,256-yskip,GL_RGBA,
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GL_UNSIGNED_BYTE,ogl_fb2);
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}
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}
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else { /* non RGBA */
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for (y=0; y<h; y++)
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for (x=0; x<w; x++) {
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if (x<256) {
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ogl_fb[ y ][ x ] = *(fb1 + (y)*scr_pitch + x);
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}
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else {
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ogl_fbb[ y ][ x - 256 ] = *(fb1 + y*scr_pitch + x);
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}
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}
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/* Update 256x256 texture */
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glBindTexture(GL_TEXTURE_2D,texture);
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glTexSubImage2D(GL_TEXTURE_2D,0,xskip,yskip,256-xskip,256-yskip,
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GL_COLOR_INDEX, GL_UNSIGNED_BYTE,ogl_fb);
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if (fb2gl_t320) {
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/* Update 64x256 texture */
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glBindTexture(GL_TEXTURE_2D,textureb);
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glTexSubImage2D(GL_TEXTURE_2D,0,xskip,yskip,64-xskip,256-yskip,
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GL_COLOR_INDEX, GL_UNSIGNED_BYTE,ogl_fbb);
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}
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}
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fb2gl_display();
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}
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void fb2gl_palette(int i, int r, int g, int b) {
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#ifdef OGL_1_1
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ogl_temp_ctable[i][0]=r;
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ogl_temp_ctable[i][1]=g;
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ogl_temp_ctable[i][2]=b;
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#else
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ogl_ctable[i][0]=r;
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ogl_ctable[i][1]=g;
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ogl_ctable[i][2]=b;
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#endif
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}
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void fb2gl_set_palette(int f, int n) {
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char temp[256][3];
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int i;
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#ifdef OGL_1_1
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/* No ColorTable Extension. Expand option MUST be set. */
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for (i=f; i<n; i++) {
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ogl_ctable[i][0] = ogl_temp_ctable[i][0];
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ogl_ctable[i][1] = ogl_temp_ctable[i][1];
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ogl_ctable[i][2] = ogl_temp_ctable[i][2];
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}
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#else
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if (!fb2gl_expand)
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{
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glBindTexture(GL_TEXTURE_2D,texture);
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glGetColorTable(GL_TEXTURE_2D,GL_RGB,GL_UNSIGNED_BYTE,&temp);
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for (i=f; i<n; i++) {
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temp[i][0] = ogl_ctable[i][0];
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temp[i][1] = ogl_ctable[i][1];
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temp[i][2] = ogl_ctable[i][2];
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}
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glColorTable(GL_TEXTURE_2D,GL_RGB,256,GL_RGB,GL_UNSIGNED_BYTE,&temp);
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if (fb2gl_t320) {
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glBindTexture(GL_TEXTURE_2D,textureb);
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glColorTable(GL_TEXTURE_2D,GL_RGB,256,GL_RGB,GL_UNSIGNED_BYTE,&temp);
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}
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}
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#endif
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}
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