Automatically initialize the video system and create a renderer to simplify use.
authorSam Lantinga <slouken@libsdl.org>
Wed, 28 Oct 2009 06:04:07 +0000
changeset 3417 64a60c5d502e
parent 3416 3d50171ac879
child 3418 fba883490f72
Automatically initialize the video system and create a renderer to simplify use.
src/video/SDL_sysvideo.h
src/video/SDL_video.c
test/Makefile.in
test/testspriteminimal.c
--- a/src/video/SDL_sysvideo.h	Wed Oct 28 04:33:24 2009 +0000
+++ b/src/video/SDL_sysvideo.h	Wed Oct 28 06:04:07 2009 +0000
@@ -396,6 +396,7 @@
 #endif
 
 #define SDL_CurrentDisplay	(_this->displays[_this->current_display])
+#define SDL_CurrentRenderer	(SDL_CurrentDisplay.current_renderer)
 
 extern SDL_VideoDevice *SDL_GetVideoDevice();
 extern int SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode);
--- a/src/video/SDL_video.c	Wed Oct 28 04:33:24 2009 +0000
+++ b/src/video/SDL_video.c	Wed Oct 28 06:04:07 2009 +0000
@@ -754,8 +754,10 @@
     SDL_Window *windows;
 
     if (!_this) {
-        SDL_UninitializedVideo();
-        return 0;
+        /* Initialize the video system if needed */
+        if (SDL_VideoInit(NULL, 0) < 0) {
+            return 0;
+        }
     }
     if (flags & SDL_WINDOW_OPENGL) {
         if (!_this->GL_CreateContext) {
@@ -926,15 +928,28 @@
         SDL_UninitializedVideo();
         return NULL;
     }
-    for (i = 0; i < _this->num_displays; ++i) {
-        SDL_VideoDisplay *display = &_this->displays[i];
-        for (j = 0; j < display->num_windows; ++j) {
-            SDL_Window *window = &display->windows[j];
-            if (window->id == windowID) {
+    if (windowID) {
+        for (i = 0; i < _this->num_displays; ++i) {
+            SDL_VideoDisplay *display = &_this->displays[i];
+            for (j = 0; j < display->num_windows; ++j) {
+                SDL_Window *window = &display->windows[j];
+                if (window->id == windowID) {
+                    return window;
+                }
+            }
+        }
+    } else {
+        /* Just return the first active window */
+        for (i = 0; i < _this->num_displays; ++i) {
+            SDL_VideoDisplay *display = &_this->displays[i];
+            for (j = 0; j < display->num_windows; ++j) {
+                SDL_Window *window = &display->windows[j];
                 return window;
             }
         }
     }
+    /* Couldn't find the window with the requested ID */
+    SDL_SetError("Invalid window ID");
     return NULL;
 }
 
@@ -951,6 +966,23 @@
     return &_this->displays[window->display];
 }
 
+static __inline__ SDL_Renderer *
+SDL_GetCurrentRenderer()
+{
+    SDL_Renderer *renderer;
+
+    if (!_this) {
+        SDL_UninitializedVideo();
+        return NULL;
+    }
+    if (!SDL_CurrentRenderer) {
+        if (SDL_CreateRenderer(0, -1, 0) < 0) {
+            return NULL;
+        }
+    }
+    return SDL_CurrentRenderer;
+}
+
 Uint32
 SDL_GetWindowFlags(SDL_WindowID windowID)
 {
@@ -1506,31 +1538,29 @@
         return -1;
     }
     renderer = window->renderer;
-    if (!renderer) {
-        SDL_SetError("Renderer hasn't been created yet");
-        return -1;
-    }
-    if (renderer->ActivateRenderer) {
-        if (renderer->ActivateRenderer(renderer) < 0) {
+    if (renderer) {
+        if (renderer->ActivateRenderer) {
+            if (renderer->ActivateRenderer(renderer) < 0) {
+                return -1;
+            }
+        }
+        SDL_CurrentDisplay.current_renderer = renderer;
+    } else {
+        if (SDL_CreateRenderer(windowID, -1, 0) < 0) {
             return -1;
         }
     }
-    SDL_CurrentDisplay.current_renderer = renderer;
     return 0;
 }
 
 int
 SDL_GetRendererInfo(SDL_RendererInfo * info)
 {
-    if (!_this) {
-        SDL_UninitializedVideo();
+    SDL_Renderer *renderer = SDL_GetCurrentRenderer();
+    if (!renderer) {
         return -1;
     }
-    if (!SDL_CurrentDisplay.current_renderer) {
-        SDL_SetError("There is no current renderer");
-        return -1;
-    }
-    *info = SDL_CurrentDisplay.current_renderer->info;
+    *info = renderer->info;
     return 0;
 }
 
@@ -1541,11 +1571,7 @@
     SDL_Renderer *renderer;
     SDL_Texture *texture;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return 0;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return 0;
     }
@@ -1599,9 +1625,8 @@
     }
     fmt = surface->format;
 
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
-        SDL_SetError("No current renderer available");
         return 0;
     }
 
@@ -2234,11 +2259,7 @@
 {
     SDL_Renderer *renderer;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return -1;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return -1;
     }
@@ -2258,11 +2279,7 @@
 {
     SDL_Renderer *renderer;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return -1;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return -1;
     }
@@ -2286,11 +2303,7 @@
 {
     SDL_Renderer *renderer;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return -1;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return -1;
     }
@@ -2307,11 +2320,7 @@
 {
     SDL_Renderer *renderer;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return -1;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return -1;
     }
@@ -2325,11 +2334,7 @@
     SDL_Renderer *renderer;
     SDL_Window *window;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return -1;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return -1;
     }
@@ -2355,11 +2360,7 @@
         return SDL_RenderPoint(x1, y1);
     }
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return -1;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return -1;
     }
@@ -2386,11 +2387,7 @@
     SDL_Window *window;
     SDL_Rect real_rect;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return -1;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
         return -1;
     }
@@ -2422,9 +2419,8 @@
     SDL_Rect real_srcrect;
     SDL_Rect real_dstrect;
 
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer) {
-        SDL_SetError("No current renderer available");
         return -1;
     }
     if (!texture) {
@@ -2483,11 +2479,7 @@
 {
     SDL_Renderer *renderer;
 
-    if (!_this) {
-        SDL_UninitializedVideo();
-        return;
-    }
-    renderer = SDL_CurrentDisplay.current_renderer;
+    renderer = SDL_GetCurrentRenderer();
     if (!renderer || !renderer->RenderPresent) {
         return;
     }
--- a/test/Makefile.in	Wed Oct 28 04:33:24 2009 +0000
+++ b/test/Makefile.in	Wed Oct 28 06:04:07 2009 +0000
@@ -7,7 +7,7 @@
 CFLAGS  = @CFLAGS@
 LIBS	= @LIBS@
 
-TARGETS = checkkeys$(EXE) graywin$(EXE) loopwave$(EXE) testresample$(EXE) testaudioinfo$(EXE) testmultiaudio$(EXE) testpower$(EXE) testalpha$(EXE) testbitmap$(EXE) testblitspeed$(EXE) testcursor$(EXE) testintersections$(EXE) testdraw2$(EXE) testdyngl$(EXE) testdyngles$(EXE) testerror$(EXE) testfile$(EXE) testgamma$(EXE) testgl$(EXE) testgl2$(EXE) testgles$(EXE) testhread$(EXE) testiconv$(EXE) testjoystick$(EXE) testkeys$(EXE) testlock$(EXE) testoverlay2$(EXE) testoverlay$(EXE) testpalette$(EXE) testplatform$(EXE) testsem$(EXE) testsprite$(EXE) testsprite2$(EXE) testtimer$(EXE) testver$(EXE) testvidinfo$(EXE) testwin$(EXE) testwm$(EXE) testwm2$(EXE) threadwin$(EXE) torturethread$(EXE) testloadso$(EXE) testhaptic$(EXE) testmmousetablet$(EXE) testatomic$(EXE) testime$(EXE)
+TARGETS = checkkeys$(EXE) graywin$(EXE) loopwave$(EXE) testalpha$(EXE) testatomic$(EXE) testaudioinfo$(EXE) testbitmap$(EXE) testblitspeed$(EXE) testcursor$(EXE) testdraw2$(EXE) testdyngles$(EXE) testdyngl$(EXE) testerror$(EXE) testfile$(EXE) testgamma$(EXE) testgl2$(EXE) testgles$(EXE) testgl$(EXE) testhaptic$(EXE) testhread$(EXE) testiconv$(EXE) testime$(EXE) testintersections$(EXE) testjoystick$(EXE) testkeys$(EXE) testloadso$(EXE) testlock$(EXE) testmmousetablet$(EXE) testmultiaudio$(EXE) testoverlay2$(EXE) testoverlay$(EXE) testpalette$(EXE) testplatform$(EXE) testpower$(EXE) testresample$(EXE) testsem$(EXE) testsprite2$(EXE) testsprite$(EXE) testspriteminimal$(EXE) testtimer$(EXE) testver$(EXE) testvidinfo$(EXE) testwin$(EXE) testwm2$(EXE) testwm$(EXE) threadwin$(EXE) torturethread$(EXE)
 
 all: Makefile $(TARGETS)
 
@@ -107,6 +107,9 @@
 testsem$(EXE): $(srcdir)/testsem.c
 	$(CC) -o $@ $? $(CFLAGS) $(LIBS)
 
+testspriteminimal$(EXE): $(srcdir)/testspriteminimal.c
+	$(CC) -o $@ $? $(CFLAGS) $(LIBS) @MATHLIB@
+
 testsprite$(EXE): $(srcdir)/testsprite.c
 	$(CC) -o $@ $? $(CFLAGS) $(LIBS) @MATHLIB@
 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/testspriteminimal.c	Wed Oct 28 06:04:07 2009 +0000
@@ -0,0 +1,165 @@
+/* Simple program:  Move N sprites around on the screen as fast as possible */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "SDL_events.h"
+#include "SDL_video.h"
+
+#define WINDOW_WIDTH    640
+#define WINDOW_HEIGHT   480
+#define NUM_SPRITES     100
+#define MAX_SPEED       1
+
+static SDL_TextureID sprite;
+static SDL_Rect positions[NUM_SPRITES];
+static SDL_Rect velocities[NUM_SPRITES];
+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)
+{
+    exit(rc);
+}
+
+int
+LoadSprite(char *file)
+{
+    SDL_Surface *temp;
+
+    /* Load the sprite image */
+    temp = SDL_LoadBMP(file);
+    if (temp == NULL) {
+        fprintf(stderr, "Couldn't load %s: %s", 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(0, temp);
+    if (!sprite) {
+        SDL_SetColorKey(temp, 0, 0);
+        sprite = SDL_CreateTextureFromSurface(0, temp);
+    }
+    if (!sprite) {
+        fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());
+        SDL_FreeSurface(temp);
+        return (-1);
+    }
+    SDL_FreeSurface(temp);
+
+    /* We're ready to roll. :) */
+    return (0);
+}
+
+void
+MoveSprites(SDL_WindowID window, SDL_TextureID sprite)
+{
+    int i;
+    int window_w = WINDOW_WIDTH;
+    int window_h = WINDOW_HEIGHT;
+    SDL_Rect *position, *velocity;
+
+    /* Draw a gray background */
+    SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
+    SDL_RenderFill(NULL);
+
+    /* Move the sprite, bounce at the wall, and draw */
+    for (i = 0; i < NUM_SPRITES; ++i) {
+        position = &positions[i];
+        velocity = &velocities[i];
+        position->x += velocity->x;
+        if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
+            velocity->x = -velocity->x;
+            position->x += velocity->x;
+        }
+        position->y += velocity->y;
+        if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {
+            velocity->y = -velocity->y;
+            position->y += velocity->y;
+        }
+
+        /* Blit the sprite onto the screen */
+        SDL_RenderCopy(sprite, NULL, position);
+    }
+
+    /* Update the screen! */
+    SDL_RenderPresent();
+}
+
+int
+main(int argc, char *argv[])
+{
+    SDL_WindowID window;
+    int i, done;
+    SDL_Event event;
+
+    window = SDL_CreateWindow("Happy Smileys",
+                              SDL_WINDOWPOS_UNDEFINED,
+                              SDL_WINDOWPOS_UNDEFINED,
+                              WINDOW_WIDTH, WINDOW_HEIGHT,
+                              SDL_WINDOW_SHOWN);
+    if (!window) {
+        quit(2);
+    }
+
+    if (LoadSprite("icon.bmp") < 0) {
+        quit(2);
+    }
+
+    /* Initialize the sprite positions */
+    srand(time(NULL));
+    for (i = 0; i < NUM_SPRITES; ++i) {
+        positions[i].x = rand() % (WINDOW_WIDTH - sprite_w);
+        positions[i].y = rand() % (WINDOW_HEIGHT - sprite_h);
+        positions[i].w = sprite_w;
+        positions[i].h = sprite_h;
+        velocities[i].x = 0;
+        velocities[i].y = 0;
+        while (!velocities[i].x && !velocities[i].y) {
+            velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
+            velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
+        }
+    }
+
+    /* Main render loop */
+    done = 0;
+    while (!done) {
+        /* Check for events */
+        while (SDL_PollEvent(&event)) {
+            if (event.type == SDL_QUIT || event.type == SDL_KEYDOWN) {
+                done = 1;
+            }
+        }
+        MoveSprites(window, sprite);
+    }
+
+    quit(0);
+}
+
+/* vi: set ts=4 sw=4 expandtab: */