diff options
Diffstat (limited to 'tests/sdl_fog_linear.c')
-rw-r--r-- | tests/sdl_fog_linear.c | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/tests/sdl_fog_linear.c b/tests/sdl_fog_linear.c index 8fc18b7c..f0805650 100644 --- a/tests/sdl_fog_linear.c +++ b/tests/sdl_fog_linear.c @@ -47,14 +47,12 @@ int main(int argc, char *argv[]) printf("Unable to set video mode: %s\n", SDL_GetError()); return 1; } - + // Set the OpenGL state after creating the context with SDL_SetVideoMode glClearColor( 0, 0, 0, 0 ); - -#if !EMSCRIPTEN - glEnable( GL_TEXTURE_2D ); // Need this to display a texture XXX unnecessary in OpenGL ES 2.0/WebGL -#endif + + glEnable( GL_TEXTURE_2D ); // Needed when we're using the fixed-function pipeline. glViewport( 0, 0, 640, 480 ); @@ -63,33 +61,33 @@ int main(int argc, char *argv[]) glLoadIdentity(); glOrtho( 0, 640, 480, 0, -1000, 1000 ); - + glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); - + // Load the OpenGL texture GLuint texture; // Texture object handle SDL_Surface *surface; // Gives us the information to make the texture - - if ( (surface = IMG_Load("screenshot.png")) ) { - + + if ( (surface = IMG_Load("screenshot.png")) ) { + // Check that the image's width is a power of 2 if ( (surface->w & (surface->w - 1)) != 0 ) { printf("warning: image.bmp's width is not a power of 2\n"); } - + // Also check if the height is a power of 2 if ( (surface->h & (surface->h - 1)) != 0 ) { printf("warning: image.bmp's height is not a power of 2\n"); } - + // Have OpenGL generate a texture object handle for us glGenTextures( 1, &texture ); - + // Bind the texture object glBindTexture( GL_TEXTURE_2D, texture ); - + // Set the texture's stretching properties glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); @@ -100,25 +98,25 @@ int main(int argc, char *argv[]) memset(surface->pixels, 0x66, surface->w*surface->h); // Edit the texture object's image data using the information SDL_Surface gives us - glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, surface->w, surface->h, 0, + glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels ); //SDL_UnlockSurface(surface); - } + } else { printf("SDL could not load image.bmp: %s\n", SDL_GetError()); SDL_Quit(); return 1; - } - + } + // Free the SDL_Surface only if it was successfully created - if ( surface ) { + if ( surface ) { SDL_FreeSurface( surface ); } - + // Clear the screen before drawing glClear( GL_COLOR_BUFFER_BIT ); - + // Bind the texture to which subsequent calls refer to glBindTexture( GL_TEXTURE_2D, texture ); @@ -150,9 +148,7 @@ int main(int argc, char *argv[]) glTexCoord2i( 0, 1 ); glVertex3f( 500, 410, 1 ); glEnd(); -#if !EMSCRIPTEN glDisable(GL_TEXTURE_2D); -#endif glColor3ub(90, 255, 255); glBegin( GL_QUADS ); @@ -170,7 +166,7 @@ int main(int argc, char *argv[]) glEnd(); SDL_GL_SwapBuffers(); - + #if !EMSCRIPTEN // Wait for 3 seconds to give us a chance to see the image SDL_Delay(30000); @@ -178,8 +174,8 @@ int main(int argc, char *argv[]) // Now we can delete the OpenGL texture and close down SDL glDeleteTextures( 1, &texture ); - + SDL_Quit(); - + return 0; } |