* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-
+
/* SDLEMU_OPENGL.C
SDLEMU related sources for using OpenGL with SDL.
By Niels Wagenaar | http://sdlemu.ngemu.com | shalafi@xs4all.nl
-
+
Version 1.0.001 - 4-10-2004
-
+
- Added support for 16, 24 and 32 bit textures;
- Added support for 16, 24 and 32 bit texture rendering;
#include "sdlemu_opengl.h"
+#include "log.h"
+
+// We want alpha on our OpenGL contexts...!
+// Or do we? Seems to kill performance on X...
+// Or does it? Could it be bad blitter performance?
+#define WANT_OPENGL_ALPHA
+
static SDL_Surface *texture = 0;
static GLuint texid = 0;
static GLfloat texcoord[4];
void sdlemu_init_opengl(SDL_Surface * src, SDL_Surface * dst, int texturetype, int filter, int src_bpp)
{
- printf("\nOpenGL driver information :\n");
- printf("\n");
- printf("Vendor: %s\n", glGetString(GL_VENDOR));
- printf("Renderer: %s\n", glGetString(GL_RENDERER));
- printf("Version: %s\n", glGetString(GL_VERSION));
- printf("OpenGL drawmethod: ");
+ WriteLog("\nOpenGL driver information :\n");
+ WriteLog("\n");
+ WriteLog("Vendor: %s\n", glGetString(GL_VENDOR));
+ WriteLog("Renderer: %s\n", glGetString(GL_RENDERER));
+ WriteLog("Version: %s\n", glGetString(GL_VERSION));
+ WriteLog("OpenGL drawmethod: ");
switch (texturetype)
{
case 1:
- printf("GL_QUAD rendering\n\n");
+ WriteLog("GL_QUAD rendering\n\n");
break;
default:
- printf("GL_TRIANGLE rendering\n\n");
+ WriteLog("GL_TRIANGLE rendering\n\n");
break;
}
// Let us create the texture information :
sdlemu_create_texture(src, dst, filter, src_bpp);
-
sdlemu_create_overlay(dst, src_bpp);
}
Be warned! This only works with the bpp of texture en *src set to 32.
*/
#ifdef WANT_OPENGL_ALPHA
- Uint32 saved_flags;
- Uint8 saved_alpha;
+ Uint32 saved_flags;
+ Uint8 saved_alpha;
/* Save the alpha blending attributes */
saved_flags = src->flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
glBlendFunc(GL_ONE, GL_ZERO);
glBindTexture(GL_TEXTURE_2D, texid);
- // Texturemap complete texture to surface so we have free scaling
+ // Texturemap complete texture to surface so we have free scaling
// and antialiasing
switch (texturebpp)
{
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, texture->w, texture->h,
GL_RGBA, GL_UNSIGNED_BYTE, texture->pixels);
break;
- }
+ }
// Render the texture to the screen using OpenGL!
switch (texturetype)
glDrawPixels(5, 5, GL_RGBA, GL_UNSIGNED_INT, map);//*/
// glFlush();
- SDL_GL_SwapBuffers();
+ SDL_GL_SwapBuffers();
// glFinish();
-
}
void sdlemu_close_opengl(void)
SDL_FreeSurface(overlay);
}
-void sdlemu_create_overlay(SDL_Surface * dst, int src_bpp)
+void sdlemu_create_texture(SDL_Surface * src, SDL_Surface * dst, int filter, int src_bpp)
{
// Local variables.
+ int w , h; // w and h contain the width and height of the OpenGL texture.
Uint32 rmask, gmask, bmask, amask; // Needed for creating RGBA masks.
+ int bpp;
// Delete old texture (if allocated). Useful when there is a screen resize.
- if (overlay)
- SDL_FreeSurface(overlay);
+ if (texture)
+ SDL_FreeSurface(texture);
// Texture width/height should be power of 2 of the SDL_Surface *src when using OpenGL.
// So, find the largest power of two that will contain both the width and height
- int w = power_of_two(dst->w);
- int h = power_of_two(dst->h);
-
- printf("OpenGL - Overlay size : %d x %d\n", w, h);
-
+ w = power_of_two(src->w);
+ h = power_of_two(src->h);
+
+ WriteLog("OpenGL - Texture size : %d x %d\n", w, h);
+
// Setting bpp based upon src_bpp.
- int bpp = src_bpp;
-
+ bpp = src_bpp;
+
// We allow the developer to set its own texture bpp. But if the value is NULL or
// not equal to 16, 24 or 32, we make the texturebpp the same as the BPP from src.
if (bpp == 16 || bpp == 24 || bpp == 32)
texturebpp = bpp;
else
- texturebpp = dst->format->BitsPerPixel;
+ texturebpp = src->format->BitsPerPixel;
- printf("OpenGL - Overlay depth : %d bpp\n", texturebpp);
+ WriteLog("OpenGL - Texture depth : %d bpp\n", texturebpp);
// Now were are going to create a SDL_Surface named texture. This will be our surface
// which will function as a buffer between the SDL_Surface *src and SDL_Surface *dst.
// This buffer is needed because we need to convert the SDL_Surface *src to an OpenGL
// texture with a depth of 16, 24 or 32 bpp, before we can blit the pixels to *dst
// using OpenGL.
- //
+ //
// NOTE: Seems the byte order here *is* important!
switch (texturebpp)
{
/*
According to information on the SDL mailinglist and on internet, the following
rgba masks should be the ones to use. But somehow the screen gets f*cked up and
- the RGB colours are incorrect (at least in Virtual Jaguar/SDL).
-
+ the RGB colours are incorrect (at least in Virtual Jaguar/SDL).
+
Compile with -DOPENGL_16BPP_CORRECT_RGBA to use this RGBA values.
-*/
-#ifdef OPENGL_16BPP_CORRECT_RGBA
+*/
+#ifdef OPENGL_16BPP_CORRECT_RGBA
rmask = 0x7C00;
gmask = 0x03E0;
bmask = 0x001F;
}
// Creating SDL_Surface texture based upon the above settings.
- overlay = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, texturebpp, rmask, gmask, bmask, amask);
-
+ texture = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, texturebpp, rmask, gmask, bmask, amask);
+
+ if (texture == NULL)
+ {
+ WriteLog("sdlemu_opengl: Could not create texture surface! (SDL: %s)\n", SDL_GetError());
+ }
+
+ // Setting up OpenGL
+ glDisable(GL_FOG);
+ glDisable(GL_LIGHTING);
+ glDisable(GL_CULL_FACE);
+ glDisable(GL_DEPTH_TEST);
+// glDisable(GL_BLEND);
+ glEnable(GL_BLEND);
+ glDisable(GL_NORMALIZE);
+ glDisable(GL_ALPHA_TEST);
+ glEnable(GL_TEXTURE_2D);
+// glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+// glBlendFunc(GL_ONE, GL_SRC_ALPHA);
+//This works, but in a wrong way...
+// glBlendFunc(GL_ONE, GL_ONE);
+
+ // Definitely needed for screen resolution larger then the *src.
+ // This way we can have automatic scaling functionality.
+ glViewport(0, 0, dst->w, dst->h);
+ glMatrixMode(GL_PROJECTION);
+ glPushMatrix();
+ glLoadIdentity();
+ glOrtho(0.0, (GLdouble)dst->w, (GLdouble)dst->h, 0.0, 0.0, 1.0);
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+ glLoadIdentity();
+
// Setting up the texture coordinates.
- overlayCoord[0] = 0.0f;
- overlayCoord[1] = 0.0f;
- overlayCoord[2] = (GLfloat)(dst->w) / overlay->w;
- overlayCoord[3] = (GLfloat)(dst->h) / overlay->h;
+ texcoord[0] = 0.0f;
+ texcoord[1] = 0.0f;
+ texcoord[2] = (GLfloat)(src->w) / texture->w;
+ texcoord[3] = (GLfloat)(src->h) / texture->h;
// create a RGB(A) texture for the texture surface
- glGenTextures(1, &overlayID);
- glBindTexture(GL_TEXTURE_2D, overlayID);
-
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-
+ glGenTextures(1, &texid);
+ glBindTexture(GL_TEXTURE_2D, texid);
+
+ // Setting up the OpenGL Filters. These filters are important when we/you
+ // want to scale the texture.
+ if (filter)
+ {
+ // Textures are rendered in best quality.
+ WriteLog("OpenGL filters: enabled\n");
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ }
+ else
+ {
+ // Textures are rendered in normal quality.
+ WriteLog("OpenGL filters: disabled\n");
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ }
+
// Setting texture mode.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
{
case 16:
// Normal 16bpp depth based textures consist out of GL_RGB5 and doesn't have support for Alpha channels.
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5, overlay->w, overlay->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5, texture->w, texture->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
break;
case 24:
// The 24bpp depth based textures consist out of GL_RGB8 and doesn't have support for Alpha channels.
//
// IMPORTANT : If you don't use Alpha. Use textures with a depth of 16bpp.
// If you use Alpha. Use textures with a depth of 32bpp.
- // 24bpp textures are SLOW and avoid them at all costs!
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, overlay->w, overlay->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+ // 24bpp textures are SLOW and avoid them at all costs!
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, texture->w, texture->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
break;
case 32:
default:
// The 32bpp depth based textures consist out of GL_RGBA8 and has support for Alpha channels.
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, overlay->w, overlay->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- break;
- }
-}
-
-void * sdlemuGetOverlayPixels(void)
-{
- return overlay->pixels;
-}
-
-Uint32 sdlemuGetOverlayWidthInPixels(void)
-{
- return overlay->pitch / 4;
-}
-
-void sdlemuEnableOverlay(void)
-{
- showOverlay = 1;
-}
-
-void sdlemuDisableOverlay(void)
-{
- showOverlay = 0;
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, texture->w, texture->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ break;
+ }
}
-void sdlemu_create_texture(SDL_Surface * src, SDL_Surface * dst, int filter, int src_bpp)
+void sdlemu_create_overlay(SDL_Surface * dst, int src_bpp)
{
// Local variables.
- int w , h; // w and h contain the width and height of the OpenGL texture.
Uint32 rmask, gmask, bmask, amask; // Needed for creating RGBA masks.
- int bpp;
// Delete old texture (if allocated). Useful when there is a screen resize.
- if (texture)
- SDL_FreeSurface(texture);
+ if (overlay)
+ SDL_FreeSurface(overlay);
// Texture width/height should be power of 2 of the SDL_Surface *src when using OpenGL.
// So, find the largest power of two that will contain both the width and height
- w = power_of_two(src->w);
- h = power_of_two(src->h);
-
- printf("OpenGL - Texture size : %d x %d\n", w, h);
-
+ int w = power_of_two(dst->w);
+ int h = power_of_two(dst->h);
+
+ WriteLog("OpenGL - Overlay size : %d x %d\n", w, h);
+
// Setting bpp based upon src_bpp.
- bpp = src_bpp;
-
+ int bpp = src_bpp;
+
// We allow the developer to set its own texture bpp. But if the value is NULL or
// not equal to 16, 24 or 32, we make the texturebpp the same as the BPP from src.
if (bpp == 16 || bpp == 24 || bpp == 32)
texturebpp = bpp;
else
- texturebpp = src->format->BitsPerPixel;
+ texturebpp = dst->format->BitsPerPixel;
- printf("OpenGL - Texture depth : %d bpp\n", texturebpp);
+ WriteLog("OpenGL - Overlay depth : %d bpp\n", texturebpp);
// Now were are going to create a SDL_Surface named texture. This will be our surface
// which will function as a buffer between the SDL_Surface *src and SDL_Surface *dst.
// This buffer is needed because we need to convert the SDL_Surface *src to an OpenGL
// texture with a depth of 16, 24 or 32 bpp, before we can blit the pixels to *dst
// using OpenGL.
- //
+ //
// NOTE: Seems the byte order here *is* important!
switch (texturebpp)
{
/*
According to information on the SDL mailinglist and on internet, the following
rgba masks should be the ones to use. But somehow the screen gets f*cked up and
- the RGB colours are incorrect (at least in Virtual Jaguar/SDL).
+ the RGB colours are incorrect (at least in Virtual Jaguar/SDL).
Compile with -DOPENGL_16BPP_CORRECT_RGBA to use this RGBA values.
-*/
-#ifdef OPENGL_16BPP_CORRECT_RGBA
+*/
+#ifdef OPENGL_16BPP_CORRECT_RGBA
rmask = 0x7C00;
gmask = 0x03E0;
bmask = 0x001F;
}
// Creating SDL_Surface texture based upon the above settings.
- texture = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, texturebpp, rmask, gmask, bmask, amask);
-
- // Setting up OpenGL
- glDisable(GL_FOG);
- glDisable(GL_LIGHTING);
- glDisable(GL_CULL_FACE);
- glDisable(GL_DEPTH_TEST);
-// glDisable(GL_BLEND);
- glEnable(GL_BLEND);
- glDisable(GL_NORMALIZE);
- glDisable(GL_ALPHA_TEST);
- glEnable(GL_TEXTURE_2D);
-// glBlendFunc(GL_SRC_ALPHA, GL_ONE);
-// glBlendFunc(GL_ONE, GL_SRC_ALPHA);
-//This works, but in a wrong way...
-// glBlendFunc(GL_ONE, GL_ONE);
+ overlay = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, texturebpp, rmask, gmask, bmask, amask);
- // Definitely needed for screen resolution larger then the *src.
- // This way we can have automatic scaling functionality.
- glViewport(0, 0, dst->w, dst->h);
- glMatrixMode(GL_PROJECTION);
- glPushMatrix();
- glLoadIdentity();
- glOrtho(0.0, (GLdouble)dst->w, (GLdouble)dst->h, 0.0, 0.0, 1.0);
- glMatrixMode(GL_MODELVIEW);
- glPushMatrix();
- glLoadIdentity();
+ if (overlay == NULL)
+ {
+ WriteLog("sdlemu_opengl: Could not create overlay surface! (SDL: %s)\n", SDL_GetError());
+ }
// Setting up the texture coordinates.
- texcoord[0] = 0.0f;
- texcoord[1] = 0.0f;
- texcoord[2] = (GLfloat)(src->w) / texture->w;
- texcoord[3] = (GLfloat)(src->h) / texture->h;
+ overlayCoord[0] = 0.0f;
+ overlayCoord[1] = 0.0f;
+ overlayCoord[2] = (GLfloat)(dst->w) / overlay->w;
+ overlayCoord[3] = (GLfloat)(dst->h) / overlay->h;
// create a RGB(A) texture for the texture surface
- glGenTextures(1, &texid);
- glBindTexture(GL_TEXTURE_2D, texid);
-
- // Setting up the OpenGL Filters. These filters are important when we/you
- // want to scale the texture.
- if (filter)
- {
- // Textures are rendered in best quality.
- printf("OpenGL filters: enabled\n");
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- }
- else
- {
- // Textures are rendered in normal quality.
- printf("OpenGL filters: disabled\n");
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- }
-
+ glGenTextures(1, &overlayID);
+ glBindTexture(GL_TEXTURE_2D, overlayID);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
// Setting texture mode.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
{
case 16:
// Normal 16bpp depth based textures consist out of GL_RGB5 and doesn't have support for Alpha channels.
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5, texture->w, texture->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5, overlay->w, overlay->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
break;
case 24:
// The 24bpp depth based textures consist out of GL_RGB8 and doesn't have support for Alpha channels.
//
// IMPORTANT : If you don't use Alpha. Use textures with a depth of 16bpp.
// If you use Alpha. Use textures with a depth of 32bpp.
- // 24bpp textures are SLOW and avoid them at all costs!
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, texture->w, texture->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+ // 24bpp textures are SLOW and avoid them at all costs!
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, overlay->w, overlay->h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
break;
case 32:
default:
// The 32bpp depth based textures consist out of GL_RGBA8 and has support for Alpha channels.
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, texture->w, texture->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- break;
- }
-}
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, overlay->w, overlay->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ break;
+ }
+}
+
+void * sdlemuGetOverlayPixels(void)
+{
+ return overlay->pixels;
+}
+
+Uint32 sdlemuGetOverlayWidthInPixels(void)
+{
+ return overlay->pitch / 4;
+}
+
+void sdlemuEnableOverlay(void)
+{
+ showOverlay = 1;
+}
+
+void sdlemuDisableOverlay(void)
+{
+ showOverlay = 0;
+}
projects / virtualjaguar / blobdiff