test/testviewport.c - third_party/sdl - Git at Google

 /*
   Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>

   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely.
 */
 /* Simple program:  Check viewports */

 #include <stdlib.h>
 #include <stdio.h>
 #include <time.h>

 #ifdef __EMSCRIPTEN__
 #include <emscripten/emscripten.h>
 #endif

 #include "SDL_test.h"
 #include "SDL_test_common.h"


 static SDLTest_CommonState *state;

 static SDL_Rect viewport;
 static int done, j;
 static SDL_bool use_target = SDL_FALSE;
 #ifdef __EMSCRIPTEN__
 static Uint32 wait_start;
 #endif
 static SDL_Texture *sprite;
 static int sprite_w, sprite_h;

 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
 static void
 quit(int rc)
 {
     SDLTest_CommonQuit(state);
     exit(rc);
 }

 int
 LoadSprite(char *file, SDL_Renderer *renderer)
 {
     SDL_Surface *temp;

     /* Load the sprite image */
     temp = SDL_LoadBMP(file);
     if (temp == NULL) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", file, SDL_GetError());
         return (-1);
     }
     sprite_w = temp->w;
     sprite_h = temp->h;

     /* Set transparent pixel as the pixel at (0,0) */
     if (temp->format->palette) {
         SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *) temp->pixels);
     } else {
         switch (temp->format->BitsPerPixel) {
         case 15:
             SDL_SetColorKey(temp, SDL_TRUE,
                             (*(Uint16 *) temp->pixels) & 0x00007FFF);
             break;
         case 16:
             SDL_SetColorKey(temp, SDL_TRUE, *(Uint16 *) temp->pixels);
             break;
         case 24:
             SDL_SetColorKey(temp, SDL_TRUE,
                             (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
             break;
         case 32:
             SDL_SetColorKey(temp, SDL_TRUE, *(Uint32 *) temp->pixels);
             break;
         }
     }

     /* Create textures from the image */
     sprite = SDL_CreateTextureFromSurface(renderer, temp);
     if (!sprite) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
         SDL_FreeSurface(temp);
         return (-1);
     }
     SDL_FreeSurface(temp);

     /* We're ready to roll. :) */
     return (0);
 }

 void
 DrawOnViewport(SDL_Renderer * renderer, SDL_Rect viewport)
 {
     SDL_Rect rect;

     /* Set the viewport */
     SDL_RenderSetViewport(renderer, &viewport);

     /* Draw a gray background */
     SDL_SetRenderDrawColor(renderer, 0x80, 0x80, 0x80, 0xFF);
     SDL_RenderClear(renderer);

     /* Test inside points */
     SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0x00, 0xFF);
     SDL_RenderDrawPoint(renderer, viewport.h/2 + 20, viewport.w/2);
     SDL_RenderDrawPoint(renderer, viewport.h/2 - 20, viewport.w/2);
     SDL_RenderDrawPoint(renderer, viewport.h/2     , viewport.w/2 - 20);
     SDL_RenderDrawPoint(renderer, viewport.h/2     , viewport.w/2 + 20);

     /* Test horizontal and vertical lines */
     SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0x00, 0xFF);
     SDL_RenderDrawLine(renderer, 1, 0, viewport.w-2, 0);
     SDL_RenderDrawLine(renderer, 1, viewport.h-1, viewport.w-2, viewport.h-1);
     SDL_RenderDrawLine(renderer, 0, 1, 0, viewport.h-2);
     SDL_RenderDrawLine(renderer, viewport.w-1, 1, viewport.w-1, viewport.h-2);

     /* Test diagonal lines */
     SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0xFF, 0xFF);
     SDL_RenderDrawLine(renderer, 0, 0, viewport.w-1, viewport.h-1);
     SDL_RenderDrawLine(renderer, viewport.w-1, 0, 0, viewport.h-1);

     /* Test outside points */
     SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0x00, 0xFF);
     SDL_RenderDrawPoint(renderer, viewport.h/2 + viewport.h, viewport.w/2);
     SDL_RenderDrawPoint(renderer, viewport.h/2 - viewport.h, viewport.w/2);
     SDL_RenderDrawPoint(renderer, viewport.h/2, viewport.w/2 - viewport.w);
     SDL_RenderDrawPoint(renderer, viewport.h/2, viewport.w/2 + viewport.w);

     /* Add a box at the top */
     rect.w = 8;
     rect.h = 8;
     rect.x = (viewport.w - rect.w) / 2;
     rect.y = 0;
     SDL_RenderFillRect(renderer, &rect);

     /* Add a clip rect and fill it with the sprite */
     SDL_QueryTexture(sprite, NULL, NULL, &rect.w, &rect.h);
     rect.x = (viewport.w - rect.w) / 2;
     rect.y = (viewport.h - rect.h) / 2;
     SDL_RenderSetClipRect(renderer, &rect);
     SDL_RenderCopy(renderer, sprite, NULL, &rect);
     SDL_RenderSetClipRect(renderer, NULL);
 }

 void
 loop()
 {
 #ifdef __EMSCRIPTEN__
     /* Avoid using delays */
     if(SDL_GetTicks() - wait_start < 1000)
         return;
     wait_start = SDL_GetTicks();
 #endif
     SDL_Event event;
     int i;
     /* Check for events */
     while (SDL_PollEvent(&event)) {
         SDLTest_CommonEvent(state, &event, &done);
     }

     /* Move a viewport box in steps around the screen */
     viewport.x = j * 100;
     viewport.y = viewport.x;
     viewport.w = 100 + j * 50;
     viewport.h = 100 + j * 50;
     j = (j + 1) % 4;
     SDL_Log("Current Viewport x=%i y=%i w=%i h=%i", viewport.x, viewport.y, viewport.w, viewport.h);

     for (i = 0; i < state->num_windows; ++i) {
         if (state->windows[i] == NULL)
             continue;

         /* Draw using viewport */
         DrawOnViewport(state->renderers[i], viewport);

         /* Update the screen! */
         if (use_target) {
             SDL_SetRenderTarget(state->renderers[i], NULL);
             SDL_RenderCopy(state->renderers[i], state->targets[i], NULL, NULL);
             SDL_RenderPresent(state->renderers[i]);
             SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
         } else {
             SDL_RenderPresent(state->renderers[i]);
         }
     }

 #ifdef __EMSCRIPTEN__
     if (done) {
         emscripten_cancel_main_loop();
     }
 #endif
 }

 int
 main(int argc, char *argv[])
 {
     int i;
     Uint32 then, now, frames;

     /* Initialize test framework */
     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
     if (!state) {
         return 1;
     }


     for (i = 1; i < argc;) {
         int consumed;

         consumed = SDLTest_CommonArg(state, i);
         if (consumed == 0) {
             consumed = -1;
             if (SDL_strcasecmp(argv[i], "--target") == 0) {
                 use_target = SDL_TRUE;
                 consumed = 1;
             }
         }
         if (consumed < 0) {
             static const char *options[] = { "[--target]", NULL };
             SDLTest_CommonLogUsage(state, argv[0], options);
             quit(1);
         }
         i += consumed;
     }
     if (!SDLTest_CommonInit(state)) {
         quit(2);
     }

     if (LoadSprite("icon.bmp", state->renderers[0]) < 0) {
         quit(2);
     }

     if (use_target) {
         int w, h;

         for (i = 0; i < state->num_windows; ++i) {
             SDL_GetWindowSize(state->windows[i], &w, &h);
             state->targets[i] = SDL_CreateTexture(state->renderers[i], SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h);
             SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
         }
     }

     for (i = 0; i < state->num_windows; ++i) {
         SDL_Renderer *renderer = state->renderers[i];
         SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
         SDL_RenderClear(renderer);
     }

     /* Main render loop */
     frames = 0;
     then = SDL_GetTicks();
     done = 0;
     j = 0;

 #ifdef __EMSCRIPTEN__
     wait_start = SDL_GetTicks();
     emscripten_set_main_loop(loop, 0, 1);
 #else
     while (!done) {
         ++frames;
         loop();
         SDL_Delay(1000);
     }
 #endif

     /* Print out some timing information */
     now = SDL_GetTicks();
     if (now > then) {
         double fps = ((double) frames * 1000) / (now - then);
         SDL_Log("%2.2f frames per second\n", fps);
     }
     quit(0);
     return 0;
 }

 /* vi: set ts=4 sw=4 expandtab: */
	/*
	Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>

	This software is provided 'as-is', without any express or implied
	warranty. In no event will the authors be held liable for any damages
	arising from the use of this software.

	Permission is granted to anyone to use this software for any purpose,
	including commercial applications, and to alter it and redistribute it
	freely.
	*/
	/* Simple program: Check viewports */

	#include <stdlib.h>
	#include <stdio.h>
	#include <time.h>

	#ifdef __EMSCRIPTEN__
	#include <emscripten/emscripten.h>
	#endif

	#include "SDL_test.h"
	#include "SDL_test_common.h"


	static SDLTest_CommonState *state;

	static SDL_Rect viewport;
	static int done, j;
	static SDL_bool use_target = SDL_FALSE;
	#ifdef __EMSCRIPTEN__
	static Uint32 wait_start;
	#endif
	static SDL_Texture *sprite;
	static int sprite_w, sprite_h;

	/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
	static void
	quit(int rc)
	{
	SDLTest_CommonQuit(state);
	exit(rc);
	}

	int
	LoadSprite(char file, SDL_Renderer renderer)
	{
	SDL_Surface *temp;

	/* Load the sprite image */
	temp = SDL_LoadBMP(file);
	if (temp == NULL) {
	SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", file, SDL_GetError());
	return (-1);
	}
	sprite_w = temp->w;
	sprite_h = temp->h;

	/* Set transparent pixel as the pixel at (0,0) */
	if (temp->format->palette) {
	SDL_SetColorKey(temp, SDL_TRUE, (Uint8 ) temp->pixels);
	} else {
	switch (temp->format->BitsPerPixel) {
	case 15:
	SDL_SetColorKey(temp, SDL_TRUE,
	((Uint16 ) temp->pixels) & 0x00007FFF);
	break;
	case 16:
	SDL_SetColorKey(temp, SDL_TRUE, (Uint16 ) temp->pixels);
	break;
	case 24:
	SDL_SetColorKey(temp, SDL_TRUE,
	((Uint32 ) temp->pixels) & 0x00FFFFFF);
	break;
	case 32:
	SDL_SetColorKey(temp, SDL_TRUE, (Uint32 ) temp->pixels);
	break;
	}
	}

	/* Create textures from the image */
	sprite = SDL_CreateTextureFromSurface(renderer, temp);
	if (!sprite) {
	SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
	SDL_FreeSurface(temp);
	return (-1);
	}
	SDL_FreeSurface(temp);

	/* We're ready to roll. :) */
	return (0);
	}

	void
	DrawOnViewport(SDL_Renderer * renderer, SDL_Rect viewport)
	{
	SDL_Rect rect;

	/* Set the viewport */
	SDL_RenderSetViewport(renderer, &viewport);

	/* Draw a gray background */
	SDL_SetRenderDrawColor(renderer, 0x80, 0x80, 0x80, 0xFF);
	SDL_RenderClear(renderer);

	/* Test inside points */
	SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0x00, 0xFF);
	SDL_RenderDrawPoint(renderer, viewport.h/2 + 20, viewport.w/2);
	SDL_RenderDrawPoint(renderer, viewport.h/2 - 20, viewport.w/2);
	SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 - 20);
	SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 + 20);

	/* Test horizontal and vertical lines */
	SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0x00, 0xFF);
	SDL_RenderDrawLine(renderer, 1, 0, viewport.w-2, 0);
	SDL_RenderDrawLine(renderer, 1, viewport.h-1, viewport.w-2, viewport.h-1);
	SDL_RenderDrawLine(renderer, 0, 1, 0, viewport.h-2);
	SDL_RenderDrawLine(renderer, viewport.w-1, 1, viewport.w-1, viewport.h-2);

	/* Test diagonal lines */
	SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0xFF, 0xFF);
	SDL_RenderDrawLine(renderer, 0, 0, viewport.w-1, viewport.h-1);
	SDL_RenderDrawLine(renderer, viewport.w-1, 0, 0, viewport.h-1);

	/* Test outside points */
	SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0x00, 0xFF);
	SDL_RenderDrawPoint(renderer, viewport.h/2 + viewport.h, viewport.w/2);
	SDL_RenderDrawPoint(renderer, viewport.h/2 - viewport.h, viewport.w/2);
	SDL_RenderDrawPoint(renderer, viewport.h/2, viewport.w/2 - viewport.w);
	SDL_RenderDrawPoint(renderer, viewport.h/2, viewport.w/2 + viewport.w);

	/* Add a box at the top */
	rect.w = 8;
	rect.h = 8;
	rect.x = (viewport.w - rect.w) / 2;
	rect.y = 0;
	SDL_RenderFillRect(renderer, &rect);

	/* Add a clip rect and fill it with the sprite */
	SDL_QueryTexture(sprite, NULL, NULL, &rect.w, &rect.h);
	rect.x = (viewport.w - rect.w) / 2;
	rect.y = (viewport.h - rect.h) / 2;
	SDL_RenderSetClipRect(renderer, &rect);
	SDL_RenderCopy(renderer, sprite, NULL, &rect);
	SDL_RenderSetClipRect(renderer, NULL);
	}

	void
	loop()
	{
	#ifdef __EMSCRIPTEN__
	/* Avoid using delays */
	if(SDL_GetTicks() - wait_start < 1000)
	return;
	wait_start = SDL_GetTicks();
	#endif
	SDL_Event event;
	int i;
	/* Check for events */
	while (SDL_PollEvent(&event)) {
	SDLTest_CommonEvent(state, &event, &done);
	}

	/* Move a viewport box in steps around the screen */
	viewport.x = j * 100;
	viewport.y = viewport.x;
	viewport.w = 100 + j * 50;
	viewport.h = 100 + j * 50;
	j = (j + 1) % 4;
	SDL_Log("Current Viewport x=%i y=%i w=%i h=%i", viewport.x, viewport.y, viewport.w, viewport.h);

	for (i = 0; i < state->num_windows; ++i) {
	if (state->windows[i] == NULL)
	continue;

	/* Draw using viewport */
	DrawOnViewport(state->renderers[i], viewport);

	/* Update the screen! */
	if (use_target) {
	SDL_SetRenderTarget(state->renderers[i], NULL);
	SDL_RenderCopy(state->renderers[i], state->targets[i], NULL, NULL);
	SDL_RenderPresent(state->renderers[i]);
	SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
	} else {
	SDL_RenderPresent(state->renderers[i]);
	}
	}

	#ifdef __EMSCRIPTEN__
	if (done) {
	emscripten_cancel_main_loop();
	}
	#endif
	}

	int
	main(int argc, char *argv[])
	{
	int i;
	Uint32 then, now, frames;

	/* Initialize test framework */
	state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
	if (!state) {
	return 1;
	}


	for (i = 1; i < argc;) {
	int consumed;

	consumed = SDLTest_CommonArg(state, i);
	if (consumed == 0) {
	consumed = -1;
	if (SDL_strcasecmp(argv[i], "--target") == 0) {
	use_target = SDL_TRUE;
	consumed = 1;
	}
	}
	if (consumed < 0) {
	static const char *options[] = { "[--target]", NULL };
	SDLTest_CommonLogUsage(state, argv[0], options);
	quit(1);
	}
	i += consumed;
	}
	if (!SDLTest_CommonInit(state)) {
	quit(2);
	}

	if (LoadSprite("icon.bmp", state->renderers[0]) < 0) {
	quit(2);
	}

	if (use_target) {
	int w, h;

	for (i = 0; i < state->num_windows; ++i) {
	SDL_GetWindowSize(state->windows[i], &w, &h);
	state->targets[i] = SDL_CreateTexture(state->renderers[i], SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h);
	SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
	}
	}

	for (i = 0; i < state->num_windows; ++i) {
	SDL_Renderer *renderer = state->renderers[i];
	SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
	SDL_RenderClear(renderer);
	}

	/* Main render loop */
	frames = 0;
	then = SDL_GetTicks();
	done = 0;
	j = 0;

	#ifdef __EMSCRIPTEN__
	wait_start = SDL_GetTicks();
	emscripten_set_main_loop(loop, 0, 1);
	#else
	while (!done) {
	++frames;
	loop();
	SDL_Delay(1000);
	}
	#endif

	/* Print out some timing information */
	now = SDL_GetTicks();
	if (now > then) {
	double fps = ((double) frames * 1000) / (now - then);
	SDL_Log("%2.2f frames per second\n", fps);
	}
	quit(0);
	return 0;
	}

	/* vi: set ts=4 sw=4 expandtab: */