From 7c7e934dacb82150e1565ce9149c60ac6144ef31 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Tue, 23 Apr 2013 22:32:15 -0700
Subject: [PATCH] Turbo mode

---
 src/gba/gba-video.h                |  3 +++
 src/gba/renderers/video-software.c |  8 +++++++-
 src/main.c                         | 10 +++++++++-
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/gba/gba-video.h b/src/gba/gba-video.h
index c94eebf2c..5f4d52629 100644
--- a/src/gba/gba-video.h
+++ b/src/gba/gba-video.h
@@ -143,6 +143,9 @@ struct GBAVideoRenderer {
 	uint16_t* palette;
 	uint16_t* vram;
 	union GBAOAM* oam;
+
+	int framesPending;
+	int turbo;
 };
 
 struct GBAVideo {
diff --git a/src/gba/renderers/video-software.c b/src/gba/renderers/video-software.c
index 836e8275d..f7086769b 100644
--- a/src/gba/renderers/video-software.c
+++ b/src/gba/renderers/video-software.c
@@ -26,6 +26,9 @@ void GBAVideoSoftwareRendererCreate(struct GBAVideoSoftwareRenderer* renderer) {
 	renderer->d.drawScanline = GBAVideoSoftwareRendererDrawScanline;
 	renderer->d.finishFrame = GBAVideoSoftwareRendererFinishFrame;
 
+	renderer->d.turbo = 0;
+	renderer->d.framesPending = 0;
+
 	renderer->sortedBg[0] = &renderer->bg[0];
 	renderer->sortedBg[1] = &renderer->bg[1];
 	renderer->sortedBg[2] = &renderer->bg[2];
@@ -170,7 +173,10 @@ static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* rendere
 	struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
 
 	pthread_mutex_lock(&softwareRenderer->mutex);
-	pthread_cond_wait(&softwareRenderer->cond, &softwareRenderer->mutex);
+	renderer->framesPending++;
+	if (!renderer->turbo) {
+		pthread_cond_wait(&softwareRenderer->cond, &softwareRenderer->mutex);
+	}
 	pthread_mutex_unlock(&softwareRenderer->mutex);
 }
 
diff --git a/src/main.c b/src/main.c
index 71e39b6ce..b80984e85 100644
--- a/src/main.c
+++ b/src/main.c
@@ -110,8 +110,13 @@ static void _GBASDLRunloop(struct GBAThread* context, struct GLSoftwareRenderer*
 		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5, 256, 256, 0, GL_RGBA, GL_UNSIGNED_SHORT_1_5_5_5_REV, renderer->d.outputBuffer);
 		glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 
-		SDL_GL_SwapBuffers();
 		pthread_mutex_lock(&renderer->d.mutex);
+		if (renderer->d.d.framesPending) {
+			--renderer->d.d.framesPending;
+			pthread_mutex_unlock(&renderer->d.mutex);
+			SDL_GL_SwapBuffers();
+			pthread_mutex_lock(&renderer->d.mutex);
+		}
 		pthread_cond_broadcast(&renderer->d.cond);
 		pthread_mutex_unlock(&renderer->d.mutex);
 		while (SDL_PollEvent(&event)) {
@@ -168,6 +173,9 @@ static void _GBASDLHandleKeypress(struct GBAThread* context, const struct SDL_Ke
 	case SDLK_RIGHT:
 		key = GBA_KEY_RIGHT;
 		break;
+	case SDLK_TAB:
+		context->renderer->turbo = !context->renderer->turbo;
+		return;
 	default:
 		return;
 	}