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examples/renderer/01-clear: Use the color-cycle code from testvulkan.c

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(and testgpu_simple_clear.c, of course!)
This commit is contained in:
Ryan C. Gordon
2024-09-22 16:10:57 -04:00
parent 3bc2bd790c
commit 1828bde49f
2 changed files with 7 additions and 26 deletions
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31
examples/renderer/01-clear/clear.c
View File

@@ -10,18 +10,10 @@
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
/* We will use this renderer to draw into this window every frame. */
static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
/* the current red color we're clearing to. */
static Uint8 red = 0;
/* When fading up, this is 1, when fading down, it's -1. */
static int fade_direction = 1;
/* This function runs once at startup. */
SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
{
@@ -50,9 +42,12 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
/* This function runs once per frame, and is the heart of the program. */
SDL_AppResult SDL_AppIterate(void *appstate)
{
/* since we're always fading red, we leave green and blue at zero.
alpha doesn't mean much here, so leave it at full (255, no transparency). */
SDL_SetRenderDrawColor(renderer, red, 0, 0, 255);
const double now = ((double)SDL_GetTicks()) / 1000.0; /* convert from milliseconds to seconds. */
/* choose the color for the frame we will draw. The sine wave trick makes it fade between colors smoothly. */
const float red = (float) (0.5 + 0.5 * SDL_sin(now));
const float green = (float) (0.5 + 0.5 * SDL_sin(now + SDL_PI_D * 2 / 3));
const float blue = (float) (0.5 + 0.5 * SDL_sin(now + SDL_PI_D * 4 / 3));
SDL_SetRenderDrawColorFloat(renderer, red, green, blue, 1.0f); /* new color, full alpha. */
/* clear the window to the draw color. */
SDL_RenderClear(renderer);
@@ -60,20 +55,6 @@ SDL_AppResult SDL_AppIterate(void *appstate)
/* put the newly-cleared rendering on the screen. */
SDL_RenderPresent(renderer);
/* update the color for the next frame we will draw. */
if (fade_direction > 0) {
if (red == 255) {
fade_direction = -1;
} else {
red++;
}
} else if (fade_direction < 0) {
if (red == 0) {
fade_direction = 1;
} else {
red--;
}
}
return SDL_APP_CONTINUE; /* carry on with the program! */
}

2
test/testgpu_simple_clear.c
View File

@@ -91,7 +91,7 @@ SDL_AppResult SDL_AppIterate(void *appstate)
color_target_info.texture = swapchainTexture;
color_target_info.clear_color.r = (float)(0.5 + 0.5 * SDL_sin(currentTime));
color_target_info.clear_color.g = (float)(0.5 + 0.5 * SDL_sin(currentTime + SDL_PI_D * 2 / 3));
color_target_info.clear_color.b = (float)(0.5 + 0.5 * SDL_sin(currentTime + SDL_PI_D * 4 / 3));;
color_target_info.clear_color.b = (float)(0.5 + 0.5 * SDL_sin(currentTime + SDL_PI_D * 4 / 3));
color_target_info.clear_color.a = 1.0f;
color_target_info.load_op = SDL_GPU_LOADOP_CLEAR;
color_target_info.store_op = SDL_GPU_STOREOP_STORE;