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-rw-r--r--backends/sdl/fb2opengl.h521
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diff --git a/backends/sdl/fb2opengl.h b/backends/sdl/fb2opengl.h
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--- a/backends/sdl/fb2opengl.h
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-/* ScummVM - Scumm Interpreter
- * Copyright (C) 2001 Ludvig Strigeus
- * Copyright (C) 2001-2003 The ScummVM project
- *
- * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- */
-
-// FrameBuffer renderer in an OpenGL texture
-// Andre Souza <asouza_luke@yahoo.com.br>
-
-#include <SDL.h>
-#include <SDL_opengl.h>
-//#include <GL/gl.h> NOTE! Before anybody comments out SDL_opengl.h and enables this again, talk to Fingolfin first! GL/gl.h is NOT portable!
-#include <stdlib.h>
-#include <string.h>
-
-// FLAGS
-#define FB2GL_FS 1 // FULLSCREEN
-#define FB2GL_RGBA 2 // Use RGBA (else use palette)
-#define FB2GL_NO_320 4 // Don't use 320x256 texture, rather emulate with a 256x256 plus a 64x256 texture
-#define FB2GL_AUDIO 8 // Activate SDL Audio
-#define FB2GL_PITCH 16 // On fb2l_update, use pitch (else bytes per pixel)
-#define FB2GL_EXPAND 32 // Create a RGB fb with the color lookup table
-#define FB2GL_16BIT 64 // 16 BIT Color Depth
-
-// This extension isn't defined in OpenGL 1.1
-#ifndef GL_EXT_paletted_texture
-#define GL_EXT_paletted_texture 1
-#endif
-
-class FB2GL {
- private:
- SDL_Surface *screen;
- // Framebuffer for 8 bpp
- unsigned char palettedFrameBuffer1[256*320];
- unsigned char *palettedFrameBuffer2;
-// unsigned char palettedFrameBuffer1[256][256];
-// unsigned char palettedFrameBuffer2[256][64];
- // Framebuffer for RGBA
- unsigned char RGBAFrameBuffer1[256*320*4];
- unsigned char *RGBAFrameBuffer2;
-// unsigned char RGBAFrameBuffer1[256][256][4];
-// unsigned char RGBAFrameBuffer2[256][64][4];
- // Texture(s)
- GLuint texture1;
- GLuint texture2;
- // Display list
- GLuint displayList;
- // Color Table (256 colors, RGB)
- char colorTable[256][3];
- char tempColorTable[256][3]; // Support for OpenGL 1.1
- char flags;
- void makeTextures();
- void makeDisplayList(int xf, int yf);
-
- public:
-
- FB2GL() {
- flags = 0;
- screen = NULL;
-
- palettedFrameBuffer2 = palettedFrameBuffer1 + 256*256;
- RGBAFrameBuffer2 = RGBAFrameBuffer1 + 256*256*4;
- }
-
- SDL_Surface *getScreen() {
- return screen;
- };
-
- void setScreen(SDL_Surface *s) {
- screen = s;
- };
-
- int init(int width, int height, int xfix, int yfix, char _flags);
- void update(void *fb, int width, int height, int pitch, int xskip, int yskip);
- void palette(int index, int r, int g, int b);
- void setPalette(int first, int ncolors);
- void blit16(SDL_Surface *fb, int num_rect, SDL_Rect *rectlist, int xskip, int yskip);
- void display();
- void setBilinearMode(bool bilinear);
-};
-
-void FB2GL::setBilinearMode(bool bilinear) {
- const GLuint mode = bilinear ? GL_LINEAR : GL_NEAREST;
- glBindTexture(GL_TEXTURE_2D, texture1);
- // No borders
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
- // Bilinear filter
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mode);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mode);
-
- if (flags & FB2GL_NO_320) {
- glBindTexture(GL_TEXTURE_2D, texture2);
- // No borders
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
- // Bilinear filter
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mode);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mode);
- }
-}
-
-void FB2GL::makeTextures() {
- glGenTextures(0,&texture1);
- glBindTexture(GL_TEXTURE_2D,texture1);
-
- // No borders
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
-
- // Bilinear filtering
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-
- GLuint mode;
- const GLvoid *buffer1, *buffer2;
-
- if (flags & FB2GL_RGBA) {
- mode = GL_RGBA;
- buffer1 = RGBAFrameBuffer1;
- buffer2 = RGBAFrameBuffer2;
- } else {
- mode = GL_COLOR_INDEX;
- buffer1 = palettedFrameBuffer1;
- buffer2 = palettedFrameBuffer2;
- }
-
- if (flags & FB2GL_NO_320) {
- glTexImage2D(GL_TEXTURE_2D, 0, mode, 256, 256, 0, mode, GL_UNSIGNED_BYTE, buffer1);
-
- glGenTextures(1, &texture2);
- glBindTexture(GL_TEXTURE_2D, texture2);
-
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
-
- // Bilinear filtering
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-
- glTexImage2D(GL_TEXTURE_2D, 0, mode, 64, 256, 0, mode, GL_UNSIGNED_BYTE, buffer2);
- } else {
- glTexImage2D(GL_TEXTURE_2D, 0, mode, 320, 256, 0, mode, GL_UNSIGNED_BYTE, buffer1);
- }
-}
-
-
-void FB2GL::makeDisplayList(int xf, int yf) {
- GLfloat xfix = xf / 128.0f; // 128 = 256/2 (half texture => 0.0 to 1.0)
- GLfloat yfix = yf / 128.0f;
- GLfloat texture1_end; // End of 256x256 texture (from -1.0 to 1.0)
-
- if (flags & FB2GL_NO_320) {
- // Game screen width = 320
- // GL coordinates (-1.0 <= x <= 1.0, -1.0 <= y <= 1.0)
- // X axis center: GL => 0.0, Game => 320/2 = 160
- // GL texture1 width = 256 (texture2 width = 64. 256 + 64 = 320)
- // 160 = 320/2 (half width). 256 - 160 = 96
- texture1_end = 96.0f / 160.0f; // between 0.0 (center) and 1.0
- // Note: wrong value may cause black vertical line (gap
- // between texture1 and texture2 in the X axis)
- }
- else {
- texture1_end = 1.0f;
- }
-
- if (glIsList(displayList))
- glDeleteLists(displayList, 1);
-
- displayList = glGenLists(1);
- glNewList(displayList, GL_COMPILE);
-
- glEnable(GL_TEXTURE_2D);
-
- glBindTexture(GL_TEXTURE_2D, texture1);
-
- glBegin(GL_QUADS);
- // lower left
- glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, -1.0f - yfix);
- // upper left
- glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, 1.0f);
- // upper right
- glTexCoord2f(1.0f, 0.0f); glVertex2f(texture1_end + xfix, 1.0f);
- // lower right
- glTexCoord2f(1.0f, 1.0f); glVertex2f(texture1_end + xfix, -1.0f - yfix);
- glEnd();
-
- if (flags & FB2GL_NO_320) {
- // 64x256 (texture2)
- glBindTexture(GL_TEXTURE_2D, texture2);
-
- glBegin(GL_QUADS);
- // lower left
- glTexCoord2f(0.0f, 1.0f); glVertex2f(texture1_end + xfix, -1.0f - yfix);
- // upper left
- glTexCoord2f(0.0f, 0.0f); glVertex2f(texture1_end + xfix, 1.0f);
- // upper right
- glTexCoord2f(1.0f, 0.0f); glVertex2f(1.0f + xfix, 1.0f);
- // lower right
- glTexCoord2f(1.0f, 1.0f); glVertex2f(1.0f + xfix, -1.0f - yfix);
- glEnd();
- }
-
- glDisable(GL_TEXTURE_2D);
-
- glEndList();
-}
-
-int FB2GL::init(int width, int height, int xfix, int yfix, char _flags) {
- char gl_ext[4096];
- gl_ext[0]='\0';
-
- flags = _flags;
-
- // Fullscreen?
- if (!screen) {
- screen = SDL_SetVideoMode(width, height, (flags & FB2GL_16BIT ? 16: 0),
- SDL_HWPALETTE | SDL_HWSURFACE | SDL_OPENGL | SDL_GL_DOUBLEBUFFER |
- (flags & FB2GL_FS? SDL_FULLSCREEN: 0));
- }
-
-// warning("Screen BitsPerPixel: %d\n",screen->format->BitsPerPixel);
-
- if (!screen) {
- warning("Couldn't start video res %dx%d", width, height);
- return 0;
- }
-
-/*
- if (!(flags & FB2GL_RGBA)) { // Check for Paletted Texture Extension
-
- strcpy(gl_ext, (char *)glGetString(GL_EXTENSIONS));
- fprintf(stderr,"gl_ext= %s\n",gl_ext);
-
- if ( strstr( gl_ext , "GL_EXT_paletted_texture") )
- glEnable(GL_EXT_paletted_texture);
- else {
- fprintf(stderr,"Your OpenGL version doesn't support paletted texture\n");
- return 0;
- }
- }
-*/
-
- if (width>0 && height>0)
- makeTextures();
- makeDisplayList(xfix, yfix);
-
- return 1;
-}
-
-void FB2GL::display()
-{
- glCallList(displayList);
- SDL_GL_SwapBuffers();
-}
-
-void FB2GL::update(void *fb, int w, int h, int pitch, int xskip, int yskip) {
- unsigned char *tempFrameBuffer = (unsigned char *)fb;
- int x, y, scr_pitch, _byte;
-
- if (flags & FB2GL_PITCH) {
- scr_pitch = pitch;
- _byte = 0;
- } else {
- scr_pitch = w * pitch;
- _byte = pitch; // Bytes perl pixel (for RGBA mode)
- }
-
- if (flags & FB2GL_RGBA) {
-
- if (flags & FB2GL_EXPAND) { // Expand the 8 bit fb into a RGB fb
-
- for (y = yskip; y < h; y++) {
- for (x = xskip; x < w; x++) {
- if (!(flags & FB2GL_NO_320)) {
- RGBAFrameBuffer1[y*320*4 + x*4 + 0] = colorTable[*(tempFrameBuffer+x)][0];
- RGBAFrameBuffer1[y*320*4 + x*4 + 1] = colorTable[*(tempFrameBuffer+x)][1];
- RGBAFrameBuffer1[y*320*4 + x*4 + 2] = colorTable[*(tempFrameBuffer+x)][2];
- RGBAFrameBuffer1[y*320*4 + x*4 + 3] = 255;
- } else if (x < 256) {
- RGBAFrameBuffer1[y*256*4 + x*4 + 0] = colorTable[*(tempFrameBuffer+x)][0];
- RGBAFrameBuffer1[y*256*4 + x*4 + 1] = colorTable[*(tempFrameBuffer+x)][1];
- RGBAFrameBuffer1[y*256*4 + x*4 + 2] = colorTable[*(tempFrameBuffer+x)][2];
- RGBAFrameBuffer1[y*256*4 + x*4 + 3] = 255;
- } else {
- RGBAFrameBuffer2[y*64*4 + (x-256)*4 + 0] = colorTable[*(tempFrameBuffer+x)][0];
- RGBAFrameBuffer2[y*64*4 + (x-256)*4 + 1] = colorTable[*(tempFrameBuffer+x)][1];
- RGBAFrameBuffer2[y*64*4 + (x-256)*4 + 2] = colorTable[*(tempFrameBuffer+x)][2];
- RGBAFrameBuffer2[y*64*4 + (x-256)*4 + 3] = 255;
- }
- }
- tempFrameBuffer += scr_pitch; // Next row (like y++)
- }
- } else { // No expansion
- for (y = yskip; y < h; y++) {
- for (x = xskip; x < w; x++) {
- if (!(flags & FB2GL_NO_320)) {
- RGBAFrameBuffer1[(y-yskip)*320*4 + (x-xskip)*4 + 0] = *(tempFrameBuffer+(x*_byte));
- RGBAFrameBuffer1[(y-yskip)*320*4 + (x-xskip)*4 + 1] = *(tempFrameBuffer+(x*_byte)+1);
- RGBAFrameBuffer1[(y-yskip)*320*4 + (x-xskip)*4 + 2] = *(tempFrameBuffer+(x*_byte)+2);
- } else if (x < 256) {
- RGBAFrameBuffer1[(y-yskip)*256*4 + (x-xskip)*4 + 0] = *(tempFrameBuffer+(x*_byte));
- RGBAFrameBuffer1[(y-yskip)*256*4 + (x-xskip)*4 + 1] = *(tempFrameBuffer+(x*_byte)+1);
- RGBAFrameBuffer1[(y-yskip)*256*4 + (x-xskip)*4 + 2] = *(tempFrameBuffer+(x*_byte)+2);
- } else {
- RGBAFrameBuffer2[(y-yskip)*64*4 + (x-256)*4 + 0] = *(tempFrameBuffer+(x*_byte));
- RGBAFrameBuffer2[(y-yskip)*64*4 + (x-256)*4 + 1] = *(tempFrameBuffer+(x*_byte)+1);
- RGBAFrameBuffer2[(y-yskip)*64*4 + (x-256)*4 + 2] = *(tempFrameBuffer+(x*_byte)+2);
- }
- }
- tempFrameBuffer += scr_pitch; // Next row (like y++)
- }
- }
-
- if (flags & FB2GL_NO_320) {
- // Update 256x256 texture
- glBindTexture(GL_TEXTURE_2D, texture1);
- glFlush();
- glTexSubImage2D(GL_TEXTURE_2D, 0, xskip, yskip,
- 256-xskip, 256-yskip, GL_RGBA,
- GL_UNSIGNED_BYTE, RGBAFrameBuffer1);
-
- // Update 64x256 texture
- glBindTexture(GL_TEXTURE_2D, texture2);
- glFlush();
- glTexSubImage2D(GL_TEXTURE_2D, 0, xskip, yskip,
- 64-xskip, 256-yskip, GL_RGBA,
- GL_UNSIGNED_BYTE, RGBAFrameBuffer2);
- } else {
- // Update 320x256 texture
- glBindTexture(GL_TEXTURE_2D, texture1);
- glFlush();
- glTexSubImage2D(GL_TEXTURE_2D, 0, xskip, yskip,
- 320-xskip, 256-yskip, GL_RGBA,
- GL_UNSIGNED_BYTE, RGBAFrameBuffer1);
- }
-
- } else { // non RGBA (paletted)
-
- for (y=0; y<h; y++)
- for (x=0; x<w; x++) {
- if (!(flags & FB2GL_NO_320)) {
- palettedFrameBuffer1[y * 320 + x] = *(tempFrameBuffer + y*scr_pitch + x);
- } else if (x<256) {
- palettedFrameBuffer1[y * 256 + x] = *(tempFrameBuffer + y*scr_pitch + x);
- } else {
- palettedFrameBuffer2[y * 64 + (x - 256)] = *(tempFrameBuffer + y*scr_pitch + x);
- }
- }
-
- if (flags & FB2GL_NO_320) {
- // Update 256x256 texture
- glBindTexture(GL_TEXTURE_2D, texture1);
- glTexSubImage2D(GL_TEXTURE_2D, 0, xskip, yskip,
- 256-xskip, 256-yskip, GL_COLOR_INDEX,
- GL_UNSIGNED_BYTE, palettedFrameBuffer1);
-
- // Update 64x256 texture
- glBindTexture(GL_TEXTURE_2D, texture2);
- glTexSubImage2D(GL_TEXTURE_2D, 0, xskip, yskip,
- 64-xskip, 256-yskip, GL_COLOR_INDEX,
- GL_UNSIGNED_BYTE, palettedFrameBuffer2);
- } else {
- // Update 320x256 texture
- glBindTexture(GL_TEXTURE_2D, texture1);
- glTexSubImage2D(GL_TEXTURE_2D, 0, xskip, yskip,
- 320-xskip, 256-yskip, GL_COLOR_INDEX,
- GL_UNSIGNED_BYTE, palettedFrameBuffer1);
- }
-
- }
-
- display();
-}
-
-void FB2GL::blit16(SDL_Surface *fb, int num_rect, SDL_Rect *rect, int xskip, int yskip) {
- int x, y, i;
- int rx, ry, rw, rh; // rect[i].x, .y, .w, .h
- // (0 <= rx <= 320) and (0 <= ry <= 240).
- // Note: rx may be larger than texture1 width (256).
- int xend=0, yend=0; // (x + width) and (y + height)
- int pitch = fb->pitch/2; // 16 bit pointer access (not char *)
-
- // Width of the rectangle draw in texture1. (256 - rx) > 0
- unsigned int tex1_w = 0;
- // Width of the rectangle draw in texture2. (xend - 256) > 0
- unsigned int tex2_w = 0;
- // Rectangle's x coordinate in texture2. (rx - 256) > 0
- unsigned int tex2_x = 0;
-
- for (i=0; i<num_rect; i++) {
- tex1_w = tex2_w = tex2_x = 0;
- rx = rect[i].x;
- ry = rect[i].y;
- rw = rect[i].w;
- rh = rect[i].h;
- xend = rx + rw;
- yend = ry + rh;
- if (xend > fb->w) continue;
- if (yend > fb->h) continue;
-
- if (rx < 256) { // Begins before the end of texture1
- if (xend >= 256) { // Ends after texture1
- tex2_w = xend - 256; //Rectangle width on texture2
- tex1_w = rw - tex2_w; // Width left for texture1
- } else
- tex1_w = rw; // This rectangle is inside texture1
- } else {
- tex2_w = rw; // This rectangle is inside texture2
- tex2_x = rx - 256; // Relative x coordinate on texture2
- }
-
- // Note: if (tex1_w == 0) then there is no rectangle to draw
- // in texture1. The same is true for tex2_w.
-
- for (y = ry; y < yend; y++) {
- for (x = rx; x < xend; x++) {
-
- if (tex1_w && x < 256) {
- int pos = (x-rx+(y-ry)*tex1_w)*4; // (x + (y*pitch)) * RGBAsize
- SDL_GetRGB(
- ((Uint16 *)fb->pixels)[x+y*(pitch)],
- fb->format,
- &RGBAFrameBuffer1[pos],
- &RGBAFrameBuffer1[pos+1],
- &RGBAFrameBuffer1[pos+2]
- );
- } else if (tex2_w && x >= 256) {
- int rx2 = rx < 256? 256: rx;
- int pos = (x-rx2+(y-ry)*tex2_w)*4; // (x + (y*pitch)) * RGBAsize
- SDL_GetRGB(
- ((Uint16 *)fb->pixels)[x+y*(pitch)],
- fb->format,
- &RGBAFrameBuffer2[pos],
- &RGBAFrameBuffer2[pos+1],
- &RGBAFrameBuffer2[pos+2]
- );
- }
- }
- }
-
- if (tex1_w > 0) {
- // Update 256x256 texture
- glBindTexture(GL_TEXTURE_2D, texture1);
- glFlush();
- glTexSubImage2D(GL_TEXTURE_2D, 0,
- rx + xskip,
- ry + yskip,
- tex1_w, rh, GL_RGBA,
- GL_UNSIGNED_BYTE, RGBAFrameBuffer1);
- }
- if (tex2_w > 0) { // What was left for this texture
- // Update 64x256 texture
- glBindTexture(GL_TEXTURE_2D, texture2);
- glFlush();
- glTexSubImage2D(GL_TEXTURE_2D, 0,
- tex2_x + xskip,
- ry + yskip,
- tex2_w, rh, GL_RGBA,
- GL_UNSIGNED_BYTE, RGBAFrameBuffer2);
- }
- }
-}
-
-void FB2GL::palette(int i, int r, int g, int b) {
- if (flags & FB2GL_EXPAND) {
- tempColorTable[i][0] = r;
- tempColorTable[i][1] = g;
- tempColorTable[i][2] = b;
- } else { // Paletted texture
- colorTable[i][0] = r;
- colorTable[i][1] = g;
- colorTable[i][2] = b;
- }
-}
-
-void FB2GL::setPalette(int first, int n) {
- char temp[256][3];
- int i;
-
- if (flags & FB2GL_EXPAND) {
- for (i = first; i < n; i++) {
- colorTable[i][0] = tempColorTable[i][0];
- colorTable[i][1] = tempColorTable[i][1];
- colorTable[i][2] = tempColorTable[i][2];
- }
- } else { // Paletted texture
- glBindTexture(GL_TEXTURE_2D, texture1);
- glGetColorTable(GL_TEXTURE_2D, GL_RGB, GL_UNSIGNED_BYTE, &temp);
-
- for (i = first; i < n; i++) {
- temp[i][0] = colorTable[i][0];
- temp[i][1] = colorTable[i][1];
- temp[i][2] = colorTable[i][2];
- }
-
- glColorTable(GL_TEXTURE_2D, GL_RGB, 256, GL_RGB,
- GL_UNSIGNED_BYTE, &temp);
-
- if (flags & FB2GL_NO_320) {
- glBindTexture(GL_TEXTURE_2D, texture2);
- glColorTable(GL_TEXTURE_2D, GL_RGB, 256, GL_RGB,
- GL_UNSIGNED_BYTE, &temp);
- }
-
- }
-}
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