Light: Support for specularmap

The specular map is embedded in the alpha component of texture.
Alpha value of 1. means no specular, alpha of 0. means 100% specular.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14786 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/shaders/lightblend.frag

@@ -1,6 +1,7 @@
 uniform sampler2D diffuse;
 uniform sampler2D specular;
 uniform sampler2D ambient_occlusion;
+uniform sampler2D specular_map;
 uniform vec3 ambient;
 
 void main()
@@ -9,7 +10,8 @@ void main()
 
 	vec3 diffuse = texture2D(diffuse, texc).xyz;
 	vec3 spec = texture2D(specular, texc).xyz;
+	float specmap = texture2D(specular_map, texc).x;
 	float ao = texture2D(ambient_occlusion, texc).x;
 
-	gl_FragColor = vec4(diffuse + spec + ao * ambient, 1.0);
+	gl_FragColor = vec4(diffuse + spec * specmap + ao * ambient, 1.0);
 }

data/shaders/objectpass.frag

@@ -8,16 +8,19 @@ noperspective in vec3 nor;
 
 void main() {
 	vec4 light = vec4(1.0);
+	vec4 color;
 
 	if (haslightmap != 0) {
 		light = texture2D(lighttex, gl_TexCoord[1].xy);
 	}
 
 	if (hastex != 0)
-		gl_FragData[0] = texture2D(tex, gl_TexCoord[0].xy) * light;
+		color = texture2D(tex, gl_TexCoord[0].xy) * light;
 	else
-		gl_FragData[0] = gl_Color;
+		color = gl_Color;
 
+	gl_FragData[0] = vec4(color.xyz, 1.);
 	gl_FragData[1] = vec4(0.5 * normalize(nor) + 0.5, gl_FragCoord.z);
+	gl_FragData[2] = vec4(1. - color.a);
 }
 

data/shaders/objectpass_ref.frag

@@ -13,11 +13,12 @@ void main() {
 		if (col.a < 0.5)
 			discard;
 
-		gl_FragData[0] = col;
+		gl_FragData[0] = vec4(col.xyz, 1.);
 	//} else {
 	//	gl_FragData[0] = gl_Color;
 	//}
 
 	gl_FragData[1] = vec4(0.5 * normalize(nor) + 0.5, gl_FragCoord.z);
+	gl_FragData[2] = vec4(1. - col.a);
 }
 

data/shaders/objectpass_rimlit.frag

@@ -10,6 +10,7 @@ noperspective in vec3 viewpos;
 void main() {
 	float rim = 1.0 - dot(eyenor, viewpos);
 	rim = smoothstep(0.5, 1.5, rim) * 0.35;
+	vec4 color;
 
 	if (hastex != 0) {
 		vec4 col = texture2D(tex, gl_TexCoord[0].xy);
@@ -19,11 +20,13 @@ void main() {
 
 		col.xyz += rim;
 
-		gl_FragData[0] = col;
+		color = col;
 	} else {
-		gl_FragData[0] = gl_Color + vec4(vec3(rim), 0.0);
+		color = gl_Color + vec4(vec3(rim), 0.0);
 	}
 
+	gl_FragData[0] = vec4(color.xyz, 1.);
 	gl_FragData[1] = vec4(0.5 * normalize(nor) + 0.5, gl_FragCoord.z);
+	gl_FragData[2] = vec4(1. - color.a);
 }
 

src/graphics/callbacks.cpp

@@ -348,6 +348,8 @@ void LightBlendProvider::OnSetConstants(IMaterialRendererServices *srv, int)
     srv->setVertexShaderConstant("specular", &tex, 1);
     tex = 2;
     srv->setVertexShaderConstant("ambient_occlusion", &tex, 1);
+    tex = 3;
+    srv->setVertexShaderConstant("specular_map", &tex, 1);
 }
 
 //-------------------------------------

src/graphics/irr_driver.cpp

@@ -425,6 +425,7 @@ void IrrDriver::initDevice()
         m_mrt.reallocate(3);
         m_mrt.push_back(m_rtts->getRTT(RTT_COLOR));
         m_mrt.push_back(m_rtts->getRTT(RTT_NORMAL_AND_DEPTH));
+        m_mrt.push_back(m_rtts->getRTT(RTT_SPECULARMAP));
 
         irr::video::COpenGLDriver*	gl_driver = (irr::video::COpenGLDriver*)m_device->getVideoDriver();
         gl_driver->extGlGenQueries(1, &m_lensflare_query);

src/graphics/render.cpp

@@ -789,6 +789,7 @@ void IrrDriver::renderLights(const core::aabbox3df& cambox,
     lightmat.setTexture(0, m_rtts->getRTT(RTT_TMP1));
     lightmat.setTexture(1, m_rtts->getRTT(RTT_TMP2));
     lightmat.setTexture(2, m_rtts->getRTT(RTT_SSAO));
+    lightmat.setTexture(3, m_rtts->getRTT(RTT_SPECULARMAP));
 
     lightmat.MaterialType = m_shaders->getShader(ES_LIGHTBLEND);
 	if (!m_lightviz)

src/graphics/rtts.cpp

@@ -68,6 +68,7 @@ RTT::RTT()
     rtts[RTT_TMP4] = drv->addRenderTargetTexture(res, "rtt.tmp4", ECF_R8, stencil);
     rtts[RTT_NORMAL_AND_DEPTH] = drv->addRenderTargetTexture(res, "rtt.normal_and_depth", ECF_A32B32G32R32F, stencil);
     rtts[RTT_COLOR] = drv->addRenderTargetTexture(res, "rtt.color", ECF_A16B16G16R16F, stencil);
+    rtts[RTT_SPECULARMAP] = drv->addRenderTargetTexture(res, "rtt.specularmap", ECF_R8, stencil);
 
     rtts[RTT_HALF1] = drv->addRenderTargetTexture(half, "rtt.half1", ECF_A8R8G8B8, stencil);
     rtts[RTT_HALF2] = drv->addRenderTargetTexture(half, "rtt.half2", ECF_A8R8G8B8, stencil);

src/graphics/rtts.hpp

@@ -33,6 +33,7 @@ enum TypeRTT
     RTT_TMP4,
     RTT_NORMAL_AND_DEPTH,
     RTT_COLOR,
+    RTT_SPECULARMAP,
 
     RTT_HALF1,
     RTT_HALF2,