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Simplified the transparent software renderer test

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This commit is contained in:
Sam Lantinga
2025-09-04 10:15:08 -07:00
parent f48c20f481
commit a9b5a1e785
1 changed files with 43 additions and 87 deletions
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128
test/testsoftwaretransparent.c
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@@ -12,93 +12,66 @@
#include <SDL3/SDL.h> #include <SDL3/SDL.h>
#include <SDL3/SDL_main.h> #include <SDL3/SDL_main.h>
#include "glass.h" #define SQUARE_SIZE 100.0f
/* Draw opaque red squares at the four corners of the form, and draw a red square with an alpha value of 180 in the center of the form */
static void draw(SDL_Renderer *renderer)
{
SDL_FRect rect = { 0.0f, 0.0f, SQUARE_SIZE, SQUARE_SIZE };
int w, h;
SDL_GetCurrentRenderOutputSize(renderer, &w, &h);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
if (w >= 3 * SQUARE_SIZE && h >= 3 * SQUARE_SIZE) {
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
rect.x = 0.0f;
rect.y = 0.0f;
SDL_RenderFillRect(renderer, &rect);
rect.y = h - SQUARE_SIZE;
SDL_RenderFillRect(renderer, &rect);
rect.x = w - SQUARE_SIZE;
SDL_RenderFillRect(renderer, &rect);
rect.y = 0.0f;
SDL_RenderFillRect(renderer, &rect);
}
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 180);
rect.x = (w - SQUARE_SIZE) / 2;
rect.y = (h - SQUARE_SIZE) / 2;
SDL_RenderFillRect(renderer, &rect);
}
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
SDL_Window *window = NULL; SDL_Window *window = NULL;
SDL_Renderer *renderer = NULL; SDL_Renderer *renderer = NULL;
SDL_Texture *texture = NULL;
SDL_WindowFlags flags;
bool done = false; bool done = false;
SDL_Event event; SDL_Event event;
int return_code = 1; int return_code = 1;
window = SDL_CreateWindow("SDL Software Renderer Transparent Test", 800, 600, SDL_WINDOW_TRANSPARENT | SDL_WINDOW_RESIZABLE);
int windowWidth = 800;
int windowHeight = 600;
SDL_FRect destRect;
destRect.x = 0;
destRect.y = 0;
destRect.w = 100;
destRect.h = 100;
SDL_FRect destRect2;
destRect2.x = 700;
destRect2.y = 0;
destRect2.w = 100;
destRect2.h = 100;
SDL_FRect destRect3;
destRect3.x = 0;
destRect3.y = 500;
destRect3.w = 100;
destRect3.h = 100;
SDL_FRect destRect4;
destRect4.x = 700;
destRect4.y = 500;
destRect4.w = 100;
destRect4.h = 100;
SDL_FRect destRect5;
destRect5.x = 350;
destRect5.y = 250;
destRect5.w = 100;
destRect5.h = 100;
/* Create the window hidden */
flags = (SDL_WINDOW_HIDDEN | SDL_WINDOW_TRANSPARENT);
/*flags |= SDL_WINDOW_BORDERLESS;*/
window = SDL_CreateWindow("SDL Software Renderer Transparent Test", windowWidth, windowHeight, flags);
if (!window) { if (!window) {
SDL_Log("Couldn't create transparent window: %s", SDL_GetError()); SDL_Log("Couldn't create transparent window: %s", SDL_GetError());
goto quit; goto quit;
} }
/* Create a software renderer and set the blend mode */ /* Create a software renderer */
renderer = SDL_CreateRenderer(window, SDL_SOFTWARE_RENDERER); renderer = SDL_CreateRenderer(window, SDL_SOFTWARE_RENDERER);
if (!renderer) { if (!renderer) {
SDL_Log("Couldn't create renderer: %s", SDL_GetError()); SDL_Log("Couldn't create renderer: %s", SDL_GetError());
goto quit; goto quit;
} }
if (!SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND)) { /* Make sure we're setting the alpha channel while drawing */
SDL_Log("Couldn't set renderer blend mode: %s\n", SDL_GetError()); SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE);
return false;
}
/* Create texture and set the blend mode */
/* texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_TARGET, windowWidth, windowHeight); */
/* texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, windowWidth, windowHeight); */
/* texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_TARGET, windowWidth, windowHeight); */
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_BGRA8888, SDL_TEXTUREACCESS_TARGET, windowWidth, windowHeight);
if (texture == NULL) {
SDL_Log("Couldn't create texture: %s\n", SDL_GetError());
return false;
}
if (!SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND_PREMULTIPLIED)) {
SDL_Log("Couldn't set texture blend mode: %s\n", SDL_GetError());
return false;
}
/* Show */
SDL_ShowWindow(window);
/* We're ready to go! */ /* We're ready to go! */
while (!done) { while (!done) {
@@ -109,6 +82,10 @@ int main(int argc, char *argv[])
done = true; done = true;
} }
break; break;
case SDL_EVENT_WINDOW_EXPOSED:
/* The software renderer is persistent, so only redraw as-needed */
draw(renderer);
break;
case SDL_EVENT_QUIT: case SDL_EVENT_QUIT:
done = true; done = true;
break; break;
@@ -117,26 +94,6 @@ int main(int argc, char *argv[])
} }
} }
/* Draw opaque red squares at the four corners of the form, and draw a red square with an alpha value of 180 in the center of the form */
SDL_SetRenderTarget(renderer, texture);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
SDL_RenderFillRect(renderer, &destRect);
SDL_RenderFillRect(renderer, &destRect2);
SDL_RenderFillRect(renderer, &destRect3);
SDL_RenderFillRect(renderer, &destRect4);
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 180);
SDL_RenderFillRect(renderer, &destRect5);
SDL_SetRenderTarget(renderer, NULL);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
SDL_RenderTexture(renderer, texture, NULL, NULL);
/* Show everything on the screen and wait a bit */ /* Show everything on the screen and wait a bit */
SDL_RenderPresent(renderer); SDL_RenderPresent(renderer);
SDL_Delay(100); SDL_Delay(100);
@@ -146,7 +103,6 @@ int main(int argc, char *argv[])
return_code = 0; return_code = 0;
quit: quit:
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer); SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window); SDL_DestroyWindow(window);
SDL_Quit(); SDL_Quit();