testscale.c
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/*
Copyright (C) 1997-2019 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: Move N sprites around on the screen as fast as possible */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#include "SDL_test_common.h"
#define WINDOW_WIDTH 640
#define WINDOW_HEIGHT 480
static SDLTest_CommonState *state;
typedef struct {
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *background;
SDL_Texture *sprite;
SDL_Rect sprite_rect;
int scale_direction;
} DrawState;
DrawState *drawstates;
int done;
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
SDLTest_CommonQuit(state);
exit(rc);
}
SDL_Texture *
LoadTexture(SDL_Renderer *renderer, char *file, SDL_bool transparent)
{
SDL_Surface *temp;
SDL_Texture *texture;
/* Load the sprite image */
temp = SDL_LoadBMP(file);
if (temp == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
return NULL;
}
/* Set transparent pixel as the pixel at (0,0) */
if (transparent) {
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 */
texture = SDL_CreateTextureFromSurface(renderer, temp);
if (!texture) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
SDL_FreeSurface(temp);
return NULL;
}
SDL_FreeSurface(temp);
/* We're ready to roll. :) */
return texture;
}
void
Draw(DrawState *s)
{
SDL_Rect viewport;
SDL_RenderGetViewport(s->renderer, &viewport);
/* Draw the background */
SDL_RenderCopy(s->renderer, s->background, NULL, NULL);
/* Scale and draw the sprite */
s->sprite_rect.w += s->scale_direction;
s->sprite_rect.h += s->scale_direction;
if (s->scale_direction > 0) {
if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
s->scale_direction = -1;
}
} else {
if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
s->scale_direction = 1;
}
}
s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;
s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
SDL_RenderCopy(s->renderer, s->sprite, NULL, &s->sprite_rect);
/* Update the screen! */
SDL_RenderPresent(s->renderer);
}
void
loop()
{
int i;
SDL_Event event;
/* Check for events */
while (SDL_PollEvent(&event)) {
SDLTest_CommonEvent(state, &event, &done);
}
for (i = 0; i < state->num_windows; ++i) {
if (state->windows[i] == NULL)
continue;
Draw(&drawstates[i]);
}
#ifdef __EMSCRIPTEN__
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
int
main(int argc, char *argv[])
{
int i;
int frames;
Uint32 then, now;
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Initialize test framework */
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
if (!SDLTest_CommonDefaultArgs(state, argc, argv) || !SDLTest_CommonInit(state)) {
SDLTest_CommonQuit(state);
return 1;
}
drawstates = SDL_stack_alloc(DrawState, state->num_windows);
for (i = 0; i < state->num_windows; ++i) {
DrawState *drawstate = &drawstates[i];
drawstate->window = state->windows[i];
drawstate->renderer = state->renderers[i];
drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", SDL_TRUE);
drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", SDL_FALSE);
if (!drawstate->sprite || !drawstate->background) {
quit(2);
}
SDL_QueryTexture(drawstate->sprite, NULL, NULL,
&drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
drawstate->scale_direction = 1;
}
/* Main render loop */
frames = 0;
then = SDL_GetTicks();
done = 0;
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done) {
++frames;
loop();
}
#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);
}
SDL_stack_free(drawstates);
quit(0);
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */
SDLTest_CommonState::windows
SDL_Window ** windows
Definition: SDL_test_common.h:78
DrawState
Definition: testrendercopyex.c:27
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:113
SDL_RenderPresent
#define SDL_RenderPresent
Definition: SDL_dynapi_overrides.h:346
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:203
SDL_PixelFormat::BitsPerPixel
Uint8 BitsPerPixel
Definition: SDL_pixels.h:319
DrawState::window
SDL_Window * window
Definition: testrendercopyex.c:28
SDL_Surface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:70
sprite
static SDL_Texture * sprite
Definition: testspriteminimal.c:29
SDL_PollEvent
#define SDL_PollEvent
Definition: SDL_dynapi_overrides.h:122
SDL_LOG_CATEGORY_APPLICATION
@ SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
DrawState::background
SDL_Texture * background
Definition: testrendercopyex.c:30
NULL
#define NULL
Definition: begin_code.h:167
SDL_Surface::pixels
void * pixels
Definition: SDL_surface.h:76
done
int done
Definition: testscale.c:39
SDLTest_CommonState
Definition: SDL_test_common.h:51
drawstates
DrawState * drawstates
Definition: testscale.c:38
DrawState::sprite_rect
SDL_Rect sprite_rect
Definition: testrendercopyex.c:32
viewport
SDL_Rect viewport
Definition: testviewport.c:28
SDLTest_CommonState::renderers
SDL_Renderer ** renderers
Definition: SDL_test_common.h:84
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:36
SDL_Rect::w
int w
Definition: SDL_rect.h:80
SDLTest_CommonCreateState
SDLTest_CommonState * SDLTest_CommonCreateState(char **argv, Uint32 flags)
Parse command line parameters and create common state.
Definition: SDL_test_common.c:59
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:73
SDL_stack_alloc
#define SDL_stack_alloc(type, count)
Definition: SDL_stdinc.h:354
SDLTest_CommonQuit
void SDLTest_CommonQuit(SDLTest_CommonState *state)
Close test window.
Definition: SDL_test_common.c:1832
SDL_CreateTextureFromSurface
#define SDL_CreateTextureFromSurface
Definition: SDL_dynapi_overrides.h:307
SDLTest_CommonState::num_windows
int num_windows
Definition: SDL_test_common.h:77
event
struct _cl_event * event
Definition: SDL_opengl_glext.h:2649
SDL_Renderer
Definition: SDL_sysrender.h:122
SDL_FALSE
@ SDL_FALSE
Definition: SDL_stdinc.h:163
SDLTest_CommonDefaultArgs
SDL_bool SDLTest_CommonDefaultArgs(SDLTest_CommonState *state, const int argc, char **argv)
Easy argument handling when test app doesn't need any custom args.
Definition: SDL_test_common.c:516
SDL_RenderCopy
#define SDL_RenderCopy
Definition: SDL_dynapi_overrides.h:343
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:31
SDL_test_common.h
SDL_Rect::h
int h
Definition: SDL_rect.h:80
SDL_RenderGetViewport
#define SDL_RenderGetViewport
Definition: SDL_dynapi_overrides.h:325
SDL_QueryTexture
#define SDL_QueryTexture
Definition: SDL_dynapi_overrides.h:308
SDL_FreeSurface
#define SDL_FreeSurface
Definition: SDL_dynapi_overrides.h:446
SDL_PixelFormat::palette
SDL_Palette * palette
Definition: SDL_pixels.h:318
Uint16
uint16_t Uint16
Definition: SDL_stdinc.h:191
SDL_SetColorKey
#define SDL_SetColorKey
Definition: SDL_dynapi_overrides.h:453
SDL_GetTicks
Uint32 SDL_GetTicks(void)
Get the number of milliseconds since the SDL library initialization.
DrawState::renderer
SDL_Renderer * renderer
Definition: testrendercopyex.c:29
SDL_LoadBMP
#define SDL_LoadBMP(file)
Definition: SDL_surface.h:201
background
SDL_Texture * background
Definition: testgamecontroller.c:67
LoadTexture
SDL_Texture * LoadTexture(SDL_Renderer *renderer, char *file, SDL_bool transparent)
Definition: testscale.c:50
SDLTest_CommonInit
SDL_bool SDLTest_CommonInit(SDLTest_CommonState *state)
Open test window.
Definition: SDL_test_common.c:764
SDL_INIT_VIDEO
#define SDL_INIT_VIDEO
Definition: SDL.h:79
SDL_LOG_PRIORITY_INFO
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
DrawState::scale_direction
int scale_direction
Definition: testrendercopyex.c:33
renderer
static SDL_Renderer * renderer
Definition: testaudiocapture.c:21
frames
static Uint32 frames
Definition: testsprite2.c:40
SDL_TRUE
@ SDL_TRUE
Definition: SDL_stdinc.h:164
Draw
void Draw(DrawState *s)
Definition: testscale.c:100
SDL_stack_free
#define SDL_stack_free(data)
Definition: SDL_stdinc.h:355
main
int main(int argc, char *argv[])
Definition: testscale.c:153
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:236
s
GLdouble s
Definition: SDL_opengl.h:2063
loop
void loop()
Definition: testscale.c:131
SDL_Rect
A rectangle, with the origin at the upper left (integer).
Definition: SDL_rect.h:77
quit
static void quit(int rc)
Definition: testscale.c:43
SDL_Texture
Definition: SDL_sysrender.h:43
SDL_Event
General event structure.
Definition: SDL_events.h:557
SDLTest_CommonEvent
void SDLTest_CommonEvent(SDLTest_CommonState *state, SDL_Event *event, int *done)
Common event handler for test windows.
Definition: SDL_test_common.c:1501
DrawState::sprite
SDL_Texture * sprite
Definition: testrendercopyex.c:31
texture
GLenum GLenum GLuint texture
Definition: SDL_opengl_glext.h:1178
SDL_Surface::format
SDL_PixelFormat * format
Definition: SDL_surface.h:73
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
state
static SDLTest_CommonState * state
Definition: testscale.c:27
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:161
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:179