Lights: Make possible for gpu drivers to unroll loop.

GPU doesn't like indirect addressing and thus it's better to have unrolled loop. This is only possible for loop with a static iteration count.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14830 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/shaders/pointlight.frag

@@ -3,7 +3,6 @@ uniform sampler2D ntex;
 uniform vec4 center[16];
 uniform vec4 col[16];
 uniform float energy[16];
-uniform int lightcount;
 uniform float spec;
 uniform vec2 screen;
 uniform mat4 invproj;
@@ -19,7 +18,7 @@ void main() {
 
 	vec3 diffuse = vec3(0.), specular = vec3(0.);
 
-	for (int i = 0; i < lightcount; ++i) {
+	for (int i = 0; i < 16; ++i) {
 		vec4 pseudocenter = viewm * vec4(center[i].xyz, 1.0);
 		pseudocenter /= pseudocenter.w;
 		vec3 light_pos = pseudocenter.xyz;

src/graphics/callbacks.cpp

@@ -364,7 +364,6 @@ void PointLightProvider::OnSetConstants(IMaterialRendererServices *srv, int)
     srv->setVertexShaderConstant("col[0]", m_color.data(), m_color.size());
     srv->setVertexShaderConstant("center[0]", m_pos.data(), m_pos.size());
     srv->setVertexShaderConstant("viewm", m_view.pointer(), 16);
-    srv->setVertexShaderConstant("lightcount", &lightcount, 1);
 
     if (!firstdone)
     {

src/graphics/render.cpp

@@ -760,6 +760,18 @@ void IrrDriver::renderLights(const core::aabbox3df& cambox,
           break;
         }
     }
+	// Fill lights
+	for (; lightnum < MAXLIGHT; lightnum++) {
+		accumulatedLightPos.push_back(0.);
+		accumulatedLightPos.push_back(0.);
+		accumulatedLightPos.push_back(0.);
+		accumulatedLightPos.push_back(0.);
+		accumulatedLightColor.push_back(0.);
+		accumulatedLightColor.push_back(0.);
+		accumulatedLightColor.push_back(0.);
+		accumulatedLightColor.push_back(0.);
+		accumulatedLightEnergy.push_back(0.);
+	}
     LightNode::renderLightSet(accumulatedLightPos, accumulatedLightColor, accumulatedLightEnergy);
     // Handle SSAO
     SMaterial m_material;