2 Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4 This software is provided 'as-is', without any express or implied
5 warranty. In no event will the authors be held liable for any damages
6 arising from the use of this software.
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
12 /* Simple program: Check viewports */
19 #include <emscripten/emscripten.h>
23 #include "SDL_test_common.h"
26 static SDLTest_CommonState *state;
30 SDL_bool use_target = SDL_FALSE;
35 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
39 SDLTest_CommonQuit(state);
44 DrawOnViewport(SDL_Renderer * renderer, SDL_Rect viewport)
48 /* Set the viewport */
49 SDL_RenderSetViewport(renderer, &viewport);
51 /* Draw a gray background */
52 SDL_SetRenderDrawColor(renderer, 0x80, 0x80, 0x80, 0xFF);
53 SDL_RenderClear(renderer);
55 /* Test inside points */
56 SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xF, 0xFF);
57 SDL_RenderDrawPoint(renderer, viewport.h/2 + 10, viewport.w/2);
58 SDL_RenderDrawPoint(renderer, viewport.h/2 - 10, viewport.w/2);
59 SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 - 10);
60 SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 + 10);
62 /* Test horizontal and vertical lines */
63 SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0x00, 0xFF);
64 SDL_RenderDrawLine(renderer, 1, 0, viewport.w-2, 0);
65 SDL_RenderDrawLine(renderer, 1, viewport.h-1, viewport.w-2, viewport.h-1);
66 SDL_RenderDrawLine(renderer, 0, 1, 0, viewport.h-2);
67 SDL_RenderDrawLine(renderer, viewport.w-1, 1, viewport.w-1, viewport.h-2);
69 /* Test diagonal lines */
70 SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0xFF, 0xFF);
71 SDL_RenderDrawLine(renderer, 0, 0,
72 viewport.w-1, viewport.h-1);
73 SDL_RenderDrawLine(renderer, viewport.w-1, 0,
76 /* Test outside points */
77 SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xF, 0xFF);
78 SDL_RenderDrawPoint(renderer, viewport.h/2 + viewport.h, viewport.w/2);
79 SDL_RenderDrawPoint(renderer, viewport.h/2 - viewport.h, viewport.w/2);
80 SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 - viewport.w);
81 SDL_RenderDrawPoint(renderer, viewport.h/2 , viewport.w/2 + viewport.w);
83 /* Add a box at the top */
86 rect.x = (viewport.w - rect.w) / 2;
88 SDL_RenderFillRect(renderer, &rect);
95 /* Avoid using delays */
96 if(SDL_GetTicks() - wait_start < 1000)
98 wait_start = SDL_GetTicks();
102 /* Check for events */
103 while (SDL_PollEvent(&event)) {
104 SDLTest_CommonEvent(state, &event, &done);
107 /* Move a viewport box in steps around the screen */
108 viewport.x = j * 100;
109 viewport.y = viewport.x;
110 viewport.w = 100 + j * 50;
111 viewport.h = 100 + j * 50;
113 SDL_Log("Current Viewport x=%i y=%i w=%i h=%i", viewport.x, viewport.y, viewport.w, viewport.h);
115 for (i = 0; i < state->num_windows; ++i) {
116 if (state->windows[i] == NULL)
119 /* Draw using viewport */
120 DrawOnViewport(state->renderers[i], viewport);
122 /* Update the screen! */
124 SDL_SetRenderTarget(state->renderers[i], NULL);
125 SDL_RenderCopy(state->renderers[i], state->targets[i], NULL, NULL);
126 SDL_RenderPresent(state->renderers[i]);
127 SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
129 SDL_RenderPresent(state->renderers[i]);
133 #ifdef __EMSCRIPTEN__
135 emscripten_cancel_main_loop();
141 main(int argc, char *argv[])
144 Uint32 then, now, frames;
146 /* Initialize test framework */
147 state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
152 for (i = 1; i < argc;) {
155 consumed = SDLTest_CommonArg(state, i);
158 if (SDL_strcasecmp(argv[i], "--target") == 0) {
159 use_target = SDL_TRUE;
164 SDL_Log("Usage: %s %s [--target]\n",
165 argv[0], SDLTest_CommonUsage(state));
170 if (!SDLTest_CommonInit(state)) {
177 for (i = 0; i < state->num_windows; ++i) {
178 SDL_GetWindowSize(state->windows[i], &w, &h);
179 state->targets[i] = SDL_CreateTexture(state->renderers[i], SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h);
180 SDL_SetRenderTarget(state->renderers[i], state->targets[i]);
184 for (i = 0; i < state->num_windows; ++i) {
185 SDL_Renderer *renderer = state->renderers[i];
186 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
187 SDL_RenderClear(renderer);
190 /* Main render loop */
192 then = SDL_GetTicks();
196 #ifdef __EMSCRIPTEN__
197 wait_start = SDL_GetTicks();
198 emscripten_set_main_loop(loop, 0, 1);
207 /* Print out some timing information */
208 now = SDL_GetTicks();
210 double fps = ((double) frames * 1000) / (now - then);
211 SDL_Log("%2.2f frames per second\n", fps);
217 /* vi: set ts=4 sw=4 expandtab: */