#include “SDL.h”
int main(int argc, char* argv[])
{
SDL_Window* window;
SDL_Renderer* renderer;
// Initialize SDL.
if (SDL_Init(SDL_INIT_VIDEO) < 0)
return 1;
// Create the window where we will draw.
window = SDL_CreateWindow("SDL_RenderClear",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
512, 512,
SDL_WINDOW_SHOWN);
// We must call SDL_CreateRenderer in order for draw calls to
affect this window.
renderer = SDL_CreateRenderer(window, -1, 0);
// Select the color for drawing. It is set to red here.
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
whiile(!quit) {
// Clear the entire screen to our selected color.
SDL_RenderClear(renderer);
// Up until now everything was drawn behind the scenes.
// This will show the new, red contents of the window.
SDL_RenderPresent(renderer);
// Give us time to see the window.
SDL_Delay(50);
}
// Always be sure to clean up
SDL_Quit();
return 0;
}On Tue, Jul 26, 2011 at 11:53 AM, William Dyce wrote:
Dimitris: never actually used the renderer before. The documentation is
pretty good though. I’m guessing SDL_RENDERER_ACCELERATED isn’t going to
work, any suggestions for what kind?Just trying to get Code::Blocks to compile my project using SDL 1.3 rather
than 1.2 so I can do some tests on Linux as well as Android. This is looking
good so far though guys - thanks very much for all of you helpWilliam
On 26 July 2011 18:28, Dimitris Zenios <@Dimitris_Zenios> wrote:
William you can create a renderer for the window and do render present
on the renderer.hat way you will not need the opengl code.You will use
the SDL rendering apiOn Tue, Jul 26, 2011 at 10:54 AM, William Dyce wrote:
You beauty
I combined the Dimitris and Ryan’s examples (attached): I’ve never been
so
happy to see a red rectangleThe next step is getting an image to
draw,
then I’ll give input a shot. That is, after I do a bit of probing to
figure
out why it’s working now when it wasn’t before. I think it may be that
we’re
now calling OpenGL functions like glClearColor and SDL_GL_SwapWindow
rather
than the higher-level SDL_FillRect, and SDL_Flip.Any reason why SDL_Flip might not be working? This all has me very
curious… I’ll need to get SDL 1.3 set up so I can test things on Linux
as
well - pity you can’t just be a noob install it through Synaptic (which
is
what I’ve generally done for 1.2).William
On 26 July 2011 17:09, Ryan C. Gordon wrote:
Dimitris: so avoid legacy functions like SDL_SetVideoMode?
In theory, if all you want is the 1.2 API, SDL_SetVideoMode() should
do
the right thing…it just wraps the 1.3 API with some limitations (like
the
inability to have multiple windows, etc).That being said, the 1.2 emulation is not perfect in places, so you’re
probably safer using the 1.3 API directly if you can.I’ve actually been unable to find any example code that uses
SDL_CreateWindow, even in the SDL1.3 examples directory. Could you
give
me an example, and is there anything I should try to strip out?SDL/test/testgles.c
Sadly, all the important parts are all abstracted out to common.c
(where
it handles multiple windows and all sorts of options you don’t care
about,
etc), but you should be able to find what you need easily enough.Using the SDL 1.3 API isn’t much more complicated that 1.2:
?// this is untested, so forgive minor typos, please…
?// just like 1.2 (but DO check return values!)
?SDL_Init(SDL_INIT_VIDEO);
?SDL_GL_LoadLibrary(NULL);?// Make a window…
?win = SDL_CreateWindow(“My Application”,
? ? ? ? ? ?SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
? ? ? ? ? ?640, 480,
? ? ? ? ? ?SDL_WINDOW_FULLSCREEN | SDL_WINDOW_SHOWN |
? ? ? ? ? ?SDL_WINDOW_OPENGL);?// Create a GL context for that window…
?SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
?// etc…?// Make the major version 2 if you want GLES2 on Android.
?SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);
?SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 0);
?ctx = SDL_GL_CreateContext(win);
?SDL_GL_MakeCurrent(win, ctx);?// You might want this to turn on/off vsync…
?SDL_GL_SwapInterval(1); ?// 1 == vsync, 0 == no vsync.?// Now you can draw with OpenGL calls.
?// Use this instead of SDL 1.2’s SDL_GL_SwapBuffers()…
?SDL_GL_SwapWindow(win);?// At shutdown, you clean up…
?SDL_GL_MakeCurrent(NULL, NULL);
?SDL_GL_DeleteContext(ctx);
?SDL_DestroyWindow(win);?// And finally, just like 1.2…
?SDL_Quit();Some of this was just being pedantic (you don’t actually have to do the
SDL_GL_MakeCurrent() calls), but that’s about all you need to know
about
SDL’s video subsystem to move a 1.2 OpenGL app to 1.3.That being said, I can’t account for bugs in our Android port. If you
find
one, please report it.I was really worried for a long time about moving from the 1.2 API,
which
I’m extremely comfortable with, to 1.3, but the API is surprisingly
comfortable too…it feels easy like 1.2, but without 1.2’s
limitations.–ryan.
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