From f91addf88a62a3eb1e940762efdc107768ade6d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Mon, 19 May 2014 20:31:23 -0700
Subject: [PATCH] GL: Fixed HDR example.

---
 examples/09-hdr/hdr.cpp | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/examples/09-hdr/hdr.cpp b/examples/09-hdr/hdr.cpp
index 1ed22a9ca..3ab15879a 100644
--- a/examples/09-hdr/hdr.cpp
+++ b/examples/09-hdr/hdr.cpp
@@ -7,7 +7,6 @@
 #include "bgfx_utils.h"
 #include "imgui/imgui.h"
 
-static bool s_flipV = false;
 static float s_texelHalf = 0.0f;
 
 struct PosColorTexCoord0Vertex
@@ -208,6 +207,14 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 	imguiCreate(data);
 	free(data);
 
+	const bgfx::RendererType::Enum renderer = bgfx::getRendererType();
+	s_texelHalf = bgfx::RendererType::Direct3D9 == renderer ? 0.5f : 0.0f;
+	const bool  originBottomLeft = bgfx::RendererType::OpenGL == renderer || bgfx::RendererType::OpenGLES == renderer;
+
+	uint32_t oldWidth  = 0;
+	uint32_t oldHeight = 0;
+	uint32_t oldReset  = reset;
+ 
 	float speed      = 0.37f;
 	float middleGray = 0.18f;
 	float white      = 1.1f;
@@ -215,10 +222,6 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 
 	int32_t scrollArea = 0;
 
-	uint32_t oldWidth = 0;
-	uint32_t oldHeight = 0;
-	uint32_t oldReset = reset;
-
 	float time = 0.0f;
 
 	entry::MouseState mouseState;
@@ -374,7 +377,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::setTexture(0, u_texColor, fbtextures[0]);
 		bgfx::setProgram(lumProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad(128.0f, 128.0f, s_flipV);
+		screenSpaceQuad(128.0f, 128.0f, originBottomLeft);
 		bgfx::submit(2);
 
 		// Downscale luminance 0.
@@ -382,7 +385,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::setTexture(0, u_texColor, lum[0]);
 		bgfx::setProgram(lumAvgProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad(64.0f, 64.0f, s_flipV);
+		screenSpaceQuad(64.0f, 64.0f, originBottomLeft);
 		bgfx::submit(3);
 
 		// Downscale luminance 1.
@@ -390,7 +393,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::setTexture(0, u_texColor, lum[1]);
 		bgfx::setProgram(lumAvgProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad(16.0f, 16.0f, s_flipV);
+		screenSpaceQuad(16.0f, 16.0f, originBottomLeft);
 		bgfx::submit(4);
 
 		// Downscale luminance 2.
@@ -398,7 +401,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::setTexture(0, u_texColor, lum[2]);
 		bgfx::setProgram(lumAvgProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad(4.0f, 4.0f, s_flipV);
+		screenSpaceQuad(4.0f, 4.0f, originBottomLeft);
 		bgfx::submit(5);
 
 		// Downscale luminance 3.
@@ -406,7 +409,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::setTexture(0, u_texColor, lum[3]);
 		bgfx::setProgram(lumAvgProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad(1.0f, 1.0f, s_flipV);
+		screenSpaceQuad(1.0f, 1.0f, originBottomLeft);
 		bgfx::submit(6);
 
 		float tonemap[4] = { middleGray, square(white), treshold, 0.0f };
@@ -418,14 +421,14 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::setTexture(1, u_texLum, lum[4]);
 		bgfx::setProgram(brightProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad( (float)width/2.0f, (float)height/2.0f, s_flipV);
+		screenSpaceQuad( (float)width/2.0f, (float)height/2.0f, originBottomLeft);
 		bgfx::submit(7);
 
 		// Blur bright pass vertically.
 		bgfx::setTexture(0, u_texColor, bright);
 		bgfx::setProgram(blurProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad( (float)width/8.0f, (float)height/8.0f, s_flipV);
+		screenSpaceQuad( (float)width/8.0f, (float)height/8.0f, originBottomLeft);
 		bgfx::submit(8);
 
 		// Blur bright pass horizontally, do tonemaping and combine.
@@ -434,7 +437,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::setTexture(2, u_texBlur, blur);
 		bgfx::setProgram(tonemapProgram);
 		bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
-		screenSpaceQuad( (float)width, (float)height, s_flipV);
+		screenSpaceQuad( (float)width, (float)height, originBottomLeft);
 		bgfx::submit(9);
 
 		// Advance to next frame. Rendering thread will be kicked to