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kc3-lang/SDL/test/testviewport.c
Sam Lantinga
- test/testviewport.c
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/* Copyright (C) 1997-2016 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; SDL_Rect viewport; int done, j; SDL_bool use_target = SDL_FALSE; #ifdef __EMSCRIPTEN__ Uint32 wait_start; #endif /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ static void quit(int rc) { SDLTest_CommonQuit(state); exit(rc); } 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, 0xF, 0xFF); SDL_RenderDrawPoint(renderer, viewport.h/2 + 10, viewport.w/2); SDL_RenderDrawPoint(renderer, viewport.h/2 - 10, viewport.w/2); SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 - 10); SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 + 10); /* 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, 0xF, 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); } 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) { SDL_Log("Usage: %s %s [--target]\n", argv[0], SDLTest_CommonUsage(state)); quit(1); } i += consumed; } if (!SDLTest_CommonInit(state)) { 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: */