testscale.c
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/*
Copyright (C) 1997-2018 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;
}
for (i = 1; i < argc;) {
int consumed;
consumed = SDLTest_CommonArg(state, i);
if (consumed == 0) {
SDL_Log("Usage: %s %s\n", argv[0], SDLTest_CommonUsage(state));
return 1;
}
i += consumed;
}
if (!SDLTest_CommonInit(state)) {
quit(2);
}
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: */
DrawState::renderer
SDL_Renderer * renderer
Definition: testrendercopyex.c:29
SDL_PollEvent
#define SDL_PollEvent
Definition: SDL_dynapi_overrides.h:122
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:113
DrawState::sprite_rect
SDL_Rect sprite_rect
Definition: testrendercopyex.c:32
SDL_TRUE
Definition: SDL_stdinc.h:142
s
GLdouble s
Definition: SDL_opengl.h:2063
SDL_LoadBMP
#define SDL_LoadBMP(file)
Definition: SDL_surface.h:200
SDLTest_CommonCreateState
SDLTest_CommonState * SDLTest_CommonCreateState(char **argv, Uint32 flags)
Parse command line parameters and create common state.
Definition: SDL_test_common.c:48
SDL_FALSE
Definition: SDL_stdinc.h:141
SDLTest_CommonArg
int SDLTest_CommonArg(SDLTest_CommonState *state, int index)
Process one common argument.
Definition: SDL_test_common.c:106
SDL_Surface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
state
static SDLTest_CommonState * state
Definition: testscale.c:27
SDL_Renderer
Definition: SDL_sysrender.h:76
background
SDL_Texture * background
Definition: testgamecontroller.c:67
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:181
SDL_test_common.h
SDLTest_CommonInit
SDL_bool SDLTest_CommonInit(SDLTest_CommonState *state)
Open test window.
Definition: SDL_test_common.c:726
DrawState::window
SDL_Window * window
Definition: testrendercopyex.c:28
LoadTexture
SDL_Texture * LoadTexture(SDL_Renderer *renderer, char *file, SDL_bool transparent)
Definition: testscale.c:50
SDL_Texture
Definition: SDL_sysrender.h:49
SDLTest_CommonState::windows
SDL_Window ** windows
Definition: SDL_test_common.h:78
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:36
SDLTest_CommonState::num_windows
int num_windows
Definition: SDL_test_common.h:77
SDL_RenderCopy
#define SDL_RenderCopy
Definition: SDL_dynapi_overrides.h:343
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:31
drawstates
DrawState * drawstates
Definition: testscale.c:38
texture
GLenum GLenum GLuint texture
Definition: SDL_opengl_glext.h:1178
DrawState::scale_direction
int scale_direction
Definition: testrendercopyex.c:33
SDL_CreateTextureFromSurface
#define SDL_CreateTextureFromSurface
Definition: SDL_dynapi_overrides.h:307
SDLTest_CommonEvent
void SDLTest_CommonEvent(SDLTest_CommonState *state, SDL_Event *event, int *done)
Common event handler for test windows.
Definition: SDL_test_common.c:1425
SDL_GetTicks
Uint32 SDL_GetTicks(void)
Get the number of milliseconds since the SDL library initialization.
SDL_Surface::pixels
void * pixels
Definition: SDL_surface.h:75
SDL_FreeSurface
#define SDL_FreeSurface
Definition: SDL_dynapi_overrides.h:446
renderer
static SDL_Renderer * renderer
Definition: testaudiocapture.c:21
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:157
SDL_stack_alloc
#define SDL_stack_alloc(type, count)
Definition: SDL_stdinc.h:354
event
struct _cl_event * event
Definition: SDL_opengl_glext.h:2649
SDL_PixelFormat::BitsPerPixel
Uint8 BitsPerPixel
Definition: SDL_pixels.h:319
Draw
void Draw(DrawState *s)
Definition: testscale.c:100
SDL_QueryTexture
#define SDL_QueryTexture
Definition: SDL_dynapi_overrides.h:308
SDL_RenderGetViewport
#define SDL_RenderGetViewport
Definition: SDL_dynapi_overrides.h:325
SDL_SetColorKey
#define SDL_SetColorKey
Definition: SDL_dynapi_overrides.h:453
SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
SDL_Rect::x
int x
Definition: SDL_rect.h:66
SDLTest_CommonUsage
const char * SDLTest_CommonUsage(SDLTest_CommonState *state)
Returns common usage information.
Definition: SDL_test_common.c:478
loop
void loop()
Definition: testscale.c:131
SDL_Rect::w
int w
Definition: SDL_rect.h:67
DrawState
Definition: testrendercopyex.c:27
SDLTest_CommonState
Definition: SDL_test_common.h:51
SDLTest_CommonState::renderers
SDL_Renderer ** renderers
Definition: SDL_test_common.h:84
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
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:236
main
int main(int argc, char *argv[])
Definition: testscale.c:153
NULL
#define NULL
Definition: begin_code.h:164
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:139
SDL_Surface::format
SDL_PixelFormat * format
Definition: SDL_surface.h:72
quit
static void quit(int rc)
Definition: testscale.c:43
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
SDL_Rect::h
int h
Definition: SDL_rect.h:67
sprite
static SDL_Texture * sprite
Definition: testspriteminimal.c:29
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:73
viewport
SDL_Rect viewport
Definition: testviewport.c:28
DrawState::sprite
SDL_Texture * sprite
Definition: testrendercopyex.c:31
Uint16
uint16_t Uint16
Definition: SDL_stdinc.h:169
done
int done
Definition: testscale.c:39
SDL_Event
General event structure.
Definition: SDL_events.h:525
SDL_PixelFormat::palette
SDL_Palette * palette
Definition: SDL_pixels.h:318
DrawState::background
SDL_Texture * background
Definition: testrendercopyex.c:30
SDL_stack_free
#define SDL_stack_free(data)
Definition: SDL_stdinc.h:355
SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
SDL_Rect::y
int y
Definition: SDL_rect.h:66
SDLTest_CommonQuit
void SDLTest_CommonQuit(SDLTest_CommonState *state)
Close test window.
Definition: SDL_test_common.c:1751
SDL_INIT_VIDEO
#define SDL_INIT_VIDEO
Definition: SDL.h:78
SDL_Rect
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64
SDL_RenderPresent
#define SDL_RenderPresent
Definition: SDL_dynapi_overrides.h:346