1/* Copyright (c) 2013-2015 Jeffrey Pfau
 2 *
 3 * This Source Code Form is subject to the terms of the Mozilla Public
 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 6#include "main.h"
 7
 8#include "gl-common.h"
 9
10#include <mgba/core/core.h>
11#include <mgba/core/thread.h>
12#include <mgba-util/math.h>
13
14#include "platform/opengl/gl.h"
15
16static bool mSDLGLInit(struct mSDLRenderer* renderer);
17static void mSDLGLRunloop(struct mSDLRenderer* renderer, void* user);
18static void mSDLGLDeinit(struct mSDLRenderer* renderer);
19
20void mSDLGLCreate(struct mSDLRenderer* renderer) {
21	renderer->init = mSDLGLInit;
22	renderer->deinit = mSDLGLDeinit;
23	renderer->runloop = mSDLGLRunloop;
24}
25
26bool mSDLGLInit(struct mSDLRenderer* renderer) {
27	size_t size = renderer->width * renderer->height * BYTES_PER_PIXEL;
28	renderer->outputBuffer = malloc(size);
29	memset(renderer->outputBuffer, 0, size);
30	renderer->core->setVideoBuffer(renderer->core, renderer->outputBuffer, renderer->width);
31
32	mGLContextCreate(&renderer->gl);
33	renderer->gl.d.user = renderer;
34	renderer->gl.d.lockAspectRatio = renderer->lockAspectRatio;
35	renderer->gl.d.lockIntegerScaling = renderer->lockIntegerScaling;
36	renderer->gl.d.interframeBlending = renderer->interframeBlending;
37	renderer->gl.d.filter = renderer->filter;
38	renderer->gl.d.swap = mSDLGLCommonSwap;
39	renderer->gl.d.init(&renderer->gl.d, 0);
40	renderer->gl.d.setDimensions(&renderer->gl.d, renderer->width, renderer->height);
41
42	mSDLGLDoViewport(renderer->viewportWidth, renderer->viewportHeight, &renderer->gl.d);
43	return true;
44}
45
46void mSDLGLRunloop(struct mSDLRenderer* renderer, void* user) {
47	struct mCoreThread* context = user;
48	SDL_Event event;
49	struct VideoBackend* v = &renderer->gl.d;
50
51	while (mCoreThreadIsActive(context)) {
52		while (SDL_PollEvent(&event)) {
53			mSDLHandleEvent(context, &renderer->player, &event);
54			// Event handling can change the size of the screen
55			if (renderer->player.windowUpdated) {
56#if SDL_VERSION_ATLEAST(2, 0, 0)
57				SDL_GetWindowSize(renderer->window, &renderer->viewportWidth, &renderer->viewportHeight);
58#else
59				renderer->viewportWidth = renderer->player.newWidth;
60				renderer->viewportHeight = renderer->player.newHeight;
61				mSDLGLCommonInit(renderer);
62#endif
63				mSDLGLDoViewport(renderer->viewportWidth, renderer->viewportHeight, v);
64				renderer->player.windowUpdated = 0;
65			}
66		}
67		renderer->core->desiredVideoDimensions(renderer->core, &renderer->width, &renderer->height);
68		if (renderer->width != v->width || renderer->height != v->height) {
69			renderer->core->setVideoBuffer(renderer->core, renderer->outputBuffer, renderer->width);
70			v->setDimensions(v, renderer->width, renderer->height);
71		}
72
73		if (mCoreSyncWaitFrameStart(&context->impl->sync)) {
74			v->postFrame(v, renderer->outputBuffer);
75		}
76		mCoreSyncWaitFrameEnd(&context->impl->sync);
77		v->drawFrame(v);
78		v->swap(v);
79	}
80}
81
82void mSDLGLDeinit(struct mSDLRenderer* renderer) {
83	if (renderer->gl.d.deinit) {
84		renderer->gl.d.deinit(&renderer->gl.d);
85	}
86	free(renderer->outputBuffer);
87#if SDL_VERSION_ATLEAST(2, 0, 0)
88	SDL_GL_DeleteContext(renderer->glCtx);
89#endif
90}