Fixed halfTexel problem on dx9.

examples/14-shadowvolumes/fs_shadowvolume_color_lightning.sc

@@ -19,7 +19,7 @@ SAMPLER2D(u_texStencil, 7);
 
 #define u_ambientPass   u_params.x
 #define u_lightningPass u_params.y
-#define u_alpha         u_params.z
+#define u_texelHalf     u_params.z
 #define u_specular      u_specular_shininess.xyz
 #define u_shininess     u_specular_shininess.w
 
@@ -68,6 +68,7 @@ void main()
 	vec3 lightColor = calcLight(v_view, normal, viewDir) * u_lightningPass;
 
 	vec2 ndc = ((v_pos.xy / v_pos.w) + 1.0) / 2.0;
+	ndc += u_viewTexel.xy * u_texelHalf;
 	vec4 texcolor = texture2D(u_texStencil, ndc);
 	float s = (texcolor.x - texcolor.y) + 2.0 * (texcolor.z - texcolor.w);
 	s *= u_useStencilTex;
@@ -84,5 +85,5 @@ void main()
 	vec3 final   = mix(ambient, ambient + diffuse, float((abs(s) < 0.0001)));
 
 	gl_FragColor.xyz = mix(u_fogColor, final, fogFactor);
-	gl_FragColor.w   = u_alpha;
+	gl_FragColor.w   = 1.0;
 }

examples/14-shadowvolumes/fs_shadowvolume_texture_lightning.sc

@@ -20,7 +20,7 @@ SAMPLER2D(u_texStencil, 7);
 
 #define u_ambientPass   u_params.x
 #define u_lightningPass u_params.y
-#define u_alpha         u_params.z
+#define u_texelHalf     u_params.z
 #define u_specular      u_specular_shininess.xyz
 #define u_shininess     u_specular_shininess.w
 
@@ -69,6 +69,7 @@ void main()
 	vec3 lightColor = calcLight(v_view, normal, viewDir) * u_lightningPass;
 
 	vec2 ndc = ((v_pos.xy / v_pos.w) + 1.0) / 2.0;
+	ndc += u_viewTexel.xy * u_texelHalf;
 	vec4 texcolor = texture2D(u_texStencil, ndc);
 	float s = (texcolor.x - texcolor.y) + 2.0 * (texcolor.z - texcolor.w);
 	s *= u_useStencilTex;
@@ -85,6 +86,6 @@ void main()
 	vec3 final   = mix(ambient, ambient + diffuse, float((abs(s) < 0.0001)));
 
 	gl_FragColor.xyz = mix(u_fogColor, final, fogFactor);
-	gl_FragColor.w   = u_alpha;
+	gl_FragColor.w   = 1.0;
 }
 

examples/14-shadowvolumes/shadowvolumes.cpp

@@ -99,6 +99,7 @@ static const uint16_t s_planeIndices[s_numPlaneIndices] =
 
 static const char* s_shaderPath = NULL;
 static bool s_flipV = false;
+static float s_texelHalf = 0.0f;
 
 static uint32_t s_viewMask = 0;
 
@@ -266,8 +267,7 @@ struct Uniforms
 	{
 		m_params.m_ambientPass   = 1.0f;
 		m_params.m_lightningPass = 1.0f;
-		m_params.m_lightCount    = 4.0f;
-		m_params.m_alpha         = 1.0f;
+		m_params.m_texelHalf     = 0.0f;
 
 		m_ambient[0] = 0.05f;
 		m_ambient[1] = 0.05f;
@@ -374,16 +374,16 @@ struct Uniforms
 	{
 		float m_ambientPass;
 		float m_lightningPass;
-		float m_alpha;
-		float m_lightCount;
+		float m_texelHalf;
+		float m_unused00;
 	};
 
 	struct SvParams
 	{
 		float m_useStencilTex;
 		float m_dfail;
-		float m_unused0;
-		float m_unused1;
+		float m_unused10;
+		float m_unused11;
 	};
 
 	Params m_params;
@@ -402,8 +402,8 @@ struct Uniforms
 	/**
 	 * u_params.x - u_ambientPass
 	 * u_params.y - u_lightningPass
-	 * u_params.z - u_alpha
-	 * u_params.w - u_lightCount
+	 * u_params.z - u_texelHalf
+	 * u_params.w - unused
 
 	 * u_svparams.x - u_useStencilTex
 	 * u_svparams.y - u_dfail
@@ -1944,23 +1944,22 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 	default:
 	case bgfx::RendererType::Direct3D9:
 		s_shaderPath = "shaders/dx9/";
-		s_flipV = true;
+		s_texelHalf = 0.5f;
 		break;
 
 	case bgfx::RendererType::Direct3D11:
 		s_shaderPath = "shaders/dx11/";
-		s_flipV = true;
 		break;
 
 	case bgfx::RendererType::OpenGL:
 		s_shaderPath = "shaders/glsl/";
-		s_flipV = false;
+		s_flipV = true;
 		break;
 
 	case bgfx::RendererType::OpenGLES2:
 	case bgfx::RendererType::OpenGLES3:
 		s_shaderPath = "shaders/gles/";
-		s_flipV = false;
+		s_flipV = true;
 		break;
 	}
 
@@ -2331,7 +2330,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		//update settings
 		s_uniforms.m_params.m_ambientPass     = 1.0f;
 		s_uniforms.m_params.m_lightningPass   = 1.0f;
-		s_uniforms.m_params.m_lightCount      = settings_numLights;
+		s_uniforms.m_params.m_texelHalf       = s_texelHalf;
 		s_uniforms.m_svparams.m_useStencilTex = float(settings_useStencilTexture);
 		s_uniforms.submitPerFrameUniforms();
 

examples/14-shadowvolumes/vs_shadowvolume_color_lightning.sc

@@ -19,5 +19,5 @@ void main()
 	v_view = mul(u_modelView, vec4(a_position, 1.0)).xyz;
 
 	v_pos = gl_Position;
-	v_pos.y *= -u_flipV;
+	v_pos.y *= u_flipV;
 }

examples/14-shadowvolumes/vs_shadowvolume_texture_lightning.sc

@@ -21,5 +21,5 @@ void main()
 	v_texcoord0 = a_texcoord0;
 
 	v_pos = gl_Position;
-	v_pos.y *= -u_flipV;
+	v_pos.y *= u_flipV;
 }