From 591b371f2be62a8140431e9e482011c4315bc7de Mon Sep 17 00:00:00 2001
From: Alejandro Marzini
Date: Tue, 27 Jul 2010 03:16:10 +0000
Subject: OPENGL: Add shake effect.

svn-id: r51344
---
 backends/graphics/opengl/opengl-graphics.cpp | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

(limited to 'backends/graphics/opengl/opengl-graphics.cpp')

diff --git a/backends/graphics/opengl/opengl-graphics.cpp b/backends/graphics/opengl/opengl-graphics.cpp
index b3808a75ee..ac3f561f9e 100644
--- a/backends/graphics/opengl/opengl-graphics.cpp
+++ b/backends/graphics/opengl/opengl-graphics.cpp
@@ -40,7 +40,7 @@ OpenGLGraphicsManager::OpenGLGraphicsManager()
 #endif
 	_gameTexture(0), _overlayTexture(0), _cursorTexture(0),
 	_screenChangeCount(0), _screenNeedsRedraw(false),
-	_currentShakePos(0), _newShakePos(0),
+	_shakePos(0),
 	_overlayVisible(false), _overlayNeedsRedraw(false),
 	_transactionMode(kTransactionNone),
 	_cursorNeedsRedraw(false), _cursorPaletteDisabled(true),
@@ -410,7 +410,7 @@ void OpenGLGraphicsManager::updateScreen() {
 
 void OpenGLGraphicsManager::setShakePos(int shakeOffset) {
 	assert (_transactionMode == kTransactionNone);
-	_newShakePos = shakeOffset;
+	_shakePos = shakeOffset;
 }
 
 void OpenGLGraphicsManager::setFocusRectangle(const Common::Rect& rect) {
@@ -866,9 +866,17 @@ void OpenGLGraphicsManager::internUpdateScreen() {
 		// Refresh texture if dirty
 		refreshGameScreen();
 
+	int scaleFactor = _videoMode.hardwareHeight / _videoMode.screenHeight;
+
+	glPushMatrix();
+
+	glTranslatef(0, _shakePos * scaleFactor, 0); CHECK_GL_ERROR();
+
 	// Draw the game screen
 	_gameTexture->drawTexture(0, 0, _videoMode.hardwareWidth, _videoMode.hardwareHeight);
 
+	glPopMatrix();
+
 	if (_overlayVisible) {
 		if (_overlayNeedsRedraw || !_overlayDirtyRect.isEmpty())
 			// Refresh texture if dirty
@@ -883,6 +891,9 @@ void OpenGLGraphicsManager::internUpdateScreen() {
 			// Refresh texture if dirty
 			refreshCursor();
 
+		glPushMatrix();
+		glTranslatef(0, _overlayVisible ? 0 : _shakePos * scaleFactor, 0); CHECK_GL_ERROR();
+
 		// Draw the cursor
 		if (_overlayVisible)
 			_cursorTexture->drawTexture(_cursorState.x - _cursorState.rHotX,
@@ -890,6 +901,8 @@ void OpenGLGraphicsManager::internUpdateScreen() {
 		else
 			_cursorTexture->drawTexture(_cursorState.x - _cursorState.vHotX,
 				_cursorState.y - _cursorState.vHotY, _cursorState.vW, _cursorState.vH);
+
+		glPopMatrix();
 	}
 
 #ifdef USE_OSD
-- 
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