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Diffstat (limited to 'src/libs/graphics/sdl/opengl.c')
| -rw-r--r-- | src/libs/graphics/sdl/opengl.c | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/src/libs/graphics/sdl/opengl.c b/src/libs/graphics/sdl/opengl.c new file mode 100644 index 0000000..d8fe33f --- /dev/null +++ b/src/libs/graphics/sdl/opengl.c @@ -0,0 +1,575 @@ +//Copyright Paul Reiche, Fred Ford. 1992-2002 + +/* + * 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. + */ + +#ifdef HAVE_OPENGL + +#include "libs/graphics/sdl/opengl.h" +#include "libs/graphics/bbox.h" +#include "scalers.h" +#include "options.h" +#include "libs/log.h" + +#if SDL_MAJOR_VERSION == 1 + +typedef struct _gl_screeninfo { + SDL_Surface *scaled; + GLuint texture; + BOOLEAN dirty, active; + SDL_Rect updated; +} TFB_GL_SCREENINFO; + +static TFB_GL_SCREENINFO GL_Screens[TFB_GFX_NUMSCREENS]; + +static int ScreenFilterMode; + +static TFB_ScaleFunc scaler = NULL; +static BOOLEAN first_init = TRUE; + +#if SDL_BYTEORDER == SDL_BIG_ENDIAN +#define R_MASK 0xff000000 +#define G_MASK 0x00ff0000 +#define B_MASK 0x0000ff00 +#define A_MASK 0x000000ff +#else +#define R_MASK 0x000000ff +#define G_MASK 0x0000ff00 +#define B_MASK 0x00ff0000 +#define A_MASK 0xff000000 +#endif + +static void TFB_GL_Preprocess (int force_full_redraw, int transition_amount, int fade_amount); +static void TFB_GL_Postprocess (void); +static void TFB_GL_UploadTransitionScreen (void); +static void TFB_GL_Scaled_ScreenLayer (SCREEN screen, Uint8 a, SDL_Rect *rect); +static void TFB_GL_Unscaled_ScreenLayer (SCREEN screen, Uint8 a, SDL_Rect *rect); +static void TFB_GL_ColorLayer (Uint8 r, Uint8 g, Uint8 b, Uint8 a, SDL_Rect *rect); + +static TFB_GRAPHICS_BACKEND opengl_scaled_backend = { + TFB_GL_Preprocess, + TFB_GL_Postprocess, + TFB_GL_UploadTransitionScreen, + TFB_GL_Scaled_ScreenLayer, + TFB_GL_ColorLayer }; + +static TFB_GRAPHICS_BACKEND opengl_unscaled_backend = { + TFB_GL_Preprocess, + TFB_GL_Postprocess, + TFB_GL_UploadTransitionScreen, + TFB_GL_Unscaled_ScreenLayer, + TFB_GL_ColorLayer }; + + +static int +AttemptColorDepth (int flags, int width, int height, int bpp) +{ + SDL_Surface *SDL_Video; + int videomode_flags; + ScreenColorDepth = bpp; + ScreenWidthActual = width; + ScreenHeightActual = height; + + switch (bpp) { + case 15: + SDL_GL_SetAttribute (SDL_GL_RED_SIZE, 5); + SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, 5); + SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, 5); + break; + + case 16: + SDL_GL_SetAttribute (SDL_GL_RED_SIZE, 5); + SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, 6); + SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, 5); + break; + + case 24: + SDL_GL_SetAttribute (SDL_GL_RED_SIZE, 8); + SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, 8); + SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, 8); + break; + + case 32: + SDL_GL_SetAttribute (SDL_GL_RED_SIZE, 8); + SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, 8); + SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, 8); + break; + default: + break; + } + + SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, 0); + SDL_GL_SetAttribute (SDL_GL_DOUBLEBUFFER, 1); + + videomode_flags = SDL_OPENGL; + if (flags & TFB_GFXFLAGS_FULLSCREEN) + videomode_flags |= SDL_FULLSCREEN; + videomode_flags |= SDL_ANYFORMAT; + + SDL_Video = SDL_SetVideoMode (ScreenWidthActual, ScreenHeightActual, + bpp, videomode_flags); + if (SDL_Video == NULL) + { + log_add (log_Error, "Couldn't set OpenGL %ix%ix%i video mode: %s", + ScreenWidthActual, ScreenHeightActual, bpp, + SDL_GetError ()); + return -1; + } + else + { + log_add (log_Info, "Set the resolution to: %ix%ix%i" + " (surface reports %ix%ix%i)", + width, height, bpp, + SDL_GetVideoSurface()->w, SDL_GetVideoSurface()->h, + SDL_GetVideoSurface()->format->BitsPerPixel); + + log_add (log_Info, "OpenGL renderer: %s version: %s", + glGetString (GL_RENDERER), glGetString (GL_VERSION)); + } + return 0; +} + +int +TFB_GL_ConfigureVideo (int driver, int flags, int width, int height, int togglefullscreen) +{ + int i, texture_width, texture_height; + GraphicsDriver = driver; + + if (AttemptColorDepth (flags, width, height, 32) && + AttemptColorDepth (flags, width, height, 24) && + AttemptColorDepth (flags, width, height, 16)) + { + log_add (log_Error, "Couldn't set any OpenGL %ix%i video mode!", + width, height); + return -1; + } + + if (!togglefullscreen) + { + if (format_conv_surf) + SDL_FreeSurface (format_conv_surf); + format_conv_surf = SDL_CreateRGBSurface (SDL_SWSURFACE, 0, 0, 32, + R_MASK, G_MASK, B_MASK, A_MASK); + if (format_conv_surf == NULL) + { + log_add (log_Error, "Couldn't create format_conv_surf: %s", + SDL_GetError()); + return -1; + } + + for (i = 0; i < TFB_GFX_NUMSCREENS; i++) + { + if (0 != SDL1_ReInit_Screen (&SDL_Screens[i], format_conv_surf, + ScreenWidth, ScreenHeight)) + return -1; + } + + SDL_Screen = SDL_Screens[0]; + TransitionScreen = SDL_Screens[2]; + + if (first_init) + { + for (i = 0; i < TFB_GFX_NUMSCREENS; i++) + { + GL_Screens[i].scaled = NULL; + GL_Screens[i].dirty = TRUE; + GL_Screens[i].active = TRUE; + } + GL_Screens[1].active = FALSE; + first_init = FALSE; + } + } + + if (GfxFlags & TFB_GFXFLAGS_SCALE_SOFT_ONLY) + { + if (!togglefullscreen) + { + for (i = 0; i < TFB_GFX_NUMSCREENS; i++) + { + if (!GL_Screens[i].active) + continue; + if (0 != SDL1_ReInit_Screen (&GL_Screens[i].scaled, format_conv_surf, + ScreenWidth * 2, ScreenHeight * 2)) + return -1; + } + scaler = Scale_PrepPlatform (flags, SDL_Screen->format); + } + + texture_width = 1024; + texture_height = 512; + + graphics_backend = &opengl_scaled_backend; + } + else + { + texture_width = 512; + texture_height = 256; + + scaler = NULL; + graphics_backend = &opengl_unscaled_backend; + } + + + if (GfxFlags & TFB_GFXFLAGS_SCALE_ANY) + ScreenFilterMode = GL_LINEAR; + else + ScreenFilterMode = GL_NEAREST; + + glViewport (0, 0, ScreenWidthActual, ScreenHeightActual); + glClearColor (0,0,0,0); + glClear (GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); + SDL_GL_SwapBuffers (); + glClear (GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); + glDisable (GL_DITHER); + glDepthMask(GL_FALSE); + + for (i = 0; i < TFB_GFX_NUMSCREENS; i++) + { + if (!GL_Screens[i].active) + continue; + glGenTextures (1, &GL_Screens[i].texture); + glBindTexture (GL_TEXTURE_2D, GL_Screens[i].texture); + glPixelStorei (GL_UNPACK_ALIGNMENT, 1); + glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); + glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); + glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB, texture_width, texture_height, + 0, GL_RGBA, GL_UNSIGNED_BYTE, 0); + } + + return 0; +} + +int +TFB_GL_InitGraphics (int driver, int flags, int width, int height) +{ + char VideoName[256]; + + log_add (log_Info, "Initializing SDL with OpenGL support."); + + SDL_VideoDriverName (VideoName, sizeof (VideoName)); + log_add (log_Info, "SDL driver used: %s", VideoName); + log_add (log_Info, "SDL initialized."); + log_add (log_Info, "Initializing Screen."); + + ScreenWidth = 320; + ScreenHeight = 240; + + if (TFB_GL_ConfigureVideo (driver, flags, width, height, 0)) + { + log_add (log_Fatal, "Could not initialize video: " + "no fallback at start of program!"); + exit (EXIT_FAILURE); + } + + // Initialize scalers (let them precompute whatever) + Scale_Init (); + + return 0; +} + +void +TFB_GL_UninitGraphics (void) +{ + int i; + + for (i = 0; i < TFB_GFX_NUMSCREENS; i++) { + UnInit_Screen (&GL_Screens[i].scaled); + } +} + +static void +TFB_GL_UploadTransitionScreen (void) +{ + GL_Screens[TFB_SCREEN_TRANSITION].updated.x = 0; + GL_Screens[TFB_SCREEN_TRANSITION].updated.y = 0; + GL_Screens[TFB_SCREEN_TRANSITION].updated.w = ScreenWidth; + GL_Screens[TFB_SCREEN_TRANSITION].updated.h = ScreenHeight; + GL_Screens[TFB_SCREEN_TRANSITION].dirty = TRUE; +} + +static void +TFB_GL_ScanLines (void) +{ + int y; + + glDisable (GL_TEXTURE_2D); + glEnable (GL_BLEND); + glBlendFunc (GL_DST_COLOR, GL_ZERO); + glColor3f (0.85f, 0.85f, 0.85f); + for (y = 0; y < ScreenHeightActual; y += 2) + { + glBegin (GL_LINES); + glVertex2i (0, y); + glVertex2i (ScreenWidthActual, y); + glEnd (); + } + + glBlendFunc (GL_DST_COLOR, GL_ONE); + glColor3f (0.2f, 0.2f, 0.2f); + for (y = 1; y < ScreenHeightActual; y += 2) + { + glBegin (GL_LINES); + glVertex2i (0, y); + glVertex2i (ScreenWidthActual, y); + glEnd (); + } +} + +static void +TFB_GL_DrawQuad (SDL_Rect *r) +{ + BOOLEAN keep_aspect_ratio = optKeepAspectRatio; + int x1 = 0, y1 = 0, x2 = ScreenWidthActual, y2 = ScreenHeightActual; + int sx = 0, sy = 0; + int sw, sh; + float sx_multiplier = 1; + float sy_multiplier = 1; + + if (keep_aspect_ratio) + { + float threshold = 0.75f; + float ratio = ScreenHeightActual / (float)ScreenWidthActual; + + if (ratio > threshold) + { + // screen is narrower than 4:3 + int height = (int)(ScreenWidthActual * threshold); + y1 = (ScreenHeightActual - height) / 2; + y2 = ScreenHeightActual - y1; + + if (r != NULL) + { + sx_multiplier = ScreenWidthActual / (float)ScreenWidth; + sy_multiplier = height / (float)ScreenHeight; + sx = (int)(r->x * sx_multiplier); + sy = (int)(((ScreenHeight - (r->y + r->h)) * sy_multiplier) + y1); + } + } + else if (ratio < threshold) + { + // screen is wider than 4:3 + int width = (int)(ScreenHeightActual / threshold); + x1 = (ScreenWidthActual - width) / 2; + x2 = ScreenWidthActual - x1; + + if (r != NULL) + { + sx_multiplier = width / (float)ScreenWidth; + sy_multiplier = ScreenHeightActual / (float)ScreenHeight; + sx = (int)((r->x * sx_multiplier) + x1); + sy = (int)((ScreenHeight - (r->y + r->h)) * sy_multiplier); + } + } + else + { + // screen is 4:3 + keep_aspect_ratio = 0; + } + } + + if (r != NULL) + { + if (!keep_aspect_ratio) + { + sx_multiplier = ScreenWidthActual / (float)ScreenWidth; + sy_multiplier = ScreenHeightActual / (float)ScreenHeight; + sx = (int)(r->x * sx_multiplier); + sy = (int)((ScreenHeight - (r->y + r->h)) * sy_multiplier); + } + sw = (int)(r->w * sx_multiplier); + sh = (int)(r->h * sy_multiplier); + glScissor (sx, sy, sw, sh); + glEnable (GL_SCISSOR_TEST); + } + + glBegin (GL_TRIANGLE_FAN); + glTexCoord2f (0, 0); + glVertex2i (x1, y1); + glTexCoord2f (ScreenWidth / 512.0f, 0); + glVertex2i (x2, y1); + glTexCoord2f (ScreenWidth / 512.0f, ScreenHeight / 256.0f); + glVertex2i (x2, y2); + glTexCoord2f (0, ScreenHeight / 256.0f); + glVertex2i (x1, y2); + glEnd (); + if (r != NULL) + { + glDisable (GL_SCISSOR_TEST); + } +} + +static void +TFB_GL_Preprocess (int force_full_redraw, int transition_amount, int fade_amount) +{ + glMatrixMode (GL_PROJECTION); + glLoadIdentity (); + glOrtho (0,ScreenWidthActual,ScreenHeightActual, 0, -1, 1); + glMatrixMode (GL_MODELVIEW); + glLoadIdentity (); + if (optKeepAspectRatio) + glClear (GL_COLOR_BUFFER_BIT); + + (void) transition_amount; + (void) fade_amount; + + if (force_full_redraw == TFB_REDRAW_YES) + { + GL_Screens[TFB_SCREEN_MAIN].updated.x = 0; + GL_Screens[TFB_SCREEN_MAIN].updated.y = 0; + GL_Screens[TFB_SCREEN_MAIN].updated.w = ScreenWidth; + GL_Screens[TFB_SCREEN_MAIN].updated.h = ScreenHeight; + GL_Screens[TFB_SCREEN_MAIN].dirty = TRUE; + } + else if (TFB_BBox.valid) + { + GL_Screens[TFB_SCREEN_MAIN].updated.x = TFB_BBox.region.corner.x; + GL_Screens[TFB_SCREEN_MAIN].updated.y = TFB_BBox.region.corner.y; + GL_Screens[TFB_SCREEN_MAIN].updated.w = TFB_BBox.region.extent.width; + GL_Screens[TFB_SCREEN_MAIN].updated.h = TFB_BBox.region.extent.height; + GL_Screens[TFB_SCREEN_MAIN].dirty = TRUE; + } +} + +static void +TFB_GL_Unscaled_ScreenLayer (SCREEN screen, Uint8 a, SDL_Rect *rect) +{ + glBindTexture (GL_TEXTURE_2D, GL_Screens[screen].texture); + glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); + + if (GL_Screens[screen].dirty) + { + int PitchWords = SDL_Screens[screen]->pitch / 4; + glPixelStorei (GL_UNPACK_ROW_LENGTH, PitchWords); + /* Matrox OpenGL drivers do not handle GL_UNPACK_SKIP_* + correctly */ + glPixelStorei (GL_UNPACK_SKIP_ROWS, 0); + glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0); + SDL_LockSurface (SDL_Screens[screen]); + glTexSubImage2D (GL_TEXTURE_2D, 0, GL_Screens[screen].updated.x, + GL_Screens[screen].updated.y, + GL_Screens[screen].updated.w, + GL_Screens[screen].updated.h, + GL_RGBA, GL_UNSIGNED_BYTE, + (Uint32 *)SDL_Screens[screen]->pixels + + (GL_Screens[screen].updated.y * PitchWords + + GL_Screens[screen].updated.x)); + SDL_UnlockSurface (SDL_Screens[screen]); + GL_Screens[screen].dirty = FALSE; + } + + glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, ScreenFilterMode); + glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, ScreenFilterMode); + glEnable (GL_TEXTURE_2D); + + if (a == 255) + { + glDisable (GL_BLEND); + glColor4f (1, 1, 1, 1); + } + else + { + float a_f = a / 255.0f; + glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable (GL_BLEND); + glColor4f (1, 1, 1, a_f); + } + + TFB_GL_DrawQuad (rect); +} + +static void +TFB_GL_Scaled_ScreenLayer (SCREEN screen, Uint8 a, SDL_Rect *rect) +{ + glBindTexture (GL_TEXTURE_2D, GL_Screens[screen].texture); + glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); + + if (GL_Screens[screen].dirty) + { + int PitchWords = GL_Screens[screen].scaled->pitch / 4; + scaler (SDL_Screens[screen], GL_Screens[screen].scaled, &GL_Screens[screen].updated); + glPixelStorei (GL_UNPACK_ROW_LENGTH, PitchWords); + + /* Matrox OpenGL drivers do not handle GL_UNPACK_SKIP_* + correctly */ + glPixelStorei (GL_UNPACK_SKIP_ROWS, 0); + glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0); + SDL_LockSurface (GL_Screens[screen].scaled); + glTexSubImage2D (GL_TEXTURE_2D, 0, GL_Screens[screen].updated.x * 2, + GL_Screens[screen].updated.y * 2, + GL_Screens[screen].updated.w * 2, + GL_Screens[screen].updated.h * 2, + GL_RGBA, GL_UNSIGNED_BYTE, + (Uint32 *)GL_Screens[screen].scaled->pixels + + (GL_Screens[screen].updated.y * 2 * PitchWords + + GL_Screens[screen].updated.x * 2)); + SDL_UnlockSurface (GL_Screens[screen].scaled); + GL_Screens[screen].dirty = FALSE; + } + + glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, ScreenFilterMode); + glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, ScreenFilterMode); + glEnable (GL_TEXTURE_2D); + + if (a == 255) + { + glDisable (GL_BLEND); + glColor4f (1, 1, 1, 1); + } + else + { + float a_f = a / 255.0f; + glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable (GL_BLEND); + glColor4f (1, 1, 1, a_f); + } + + TFB_GL_DrawQuad (rect); +} + +static void +TFB_GL_ColorLayer (Uint8 r, Uint8 g, Uint8 b, Uint8 a, SDL_Rect *rect) +{ + float r_f = r / 255.0f; + float g_f = g / 255.0f; + float b_f = b / 255.0f; + float a_f = a / 255.0f; + glColor4f(r_f, g_f, b_f, a_f); + + glDisable (GL_TEXTURE_2D); + if (a != 255) + { + glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable (GL_BLEND); + } + else + { + glDisable (GL_BLEND); + } + + TFB_GL_DrawQuad (rect); +} + +static void +TFB_GL_Postprocess (void) +{ + if (GfxFlags & TFB_GFXFLAGS_SCANLINES) + TFB_GL_ScanLines (); + + SDL_GL_SwapBuffers (); +} + +#endif +#endif |