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;

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_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: */