SH-1682 Dynamically adjust the number of texture channels to use for indexed texture rendering based on available hardware.

6 files changed, 148 insertions, 29 deletions

diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 96b1838158..a8d7df3bc8 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -551,7 +551,7 @@ bool LLGLManager::initGL()
 	{
 		GLint num_tex_image_units;
 		glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, &num_tex_image_units);
-		mNumTextureImageUnits = num_tex_image_units;
+		mNumTextureImageUnits = llmin(num_tex_image_units, 32);
 	}
 
 	if (mHasTextureMultisample)
@@ -1516,6 +1516,7 @@ void LLGLState::checkTextureChannels(const std::string& msg)
 		}
 	}
 
+	stop_glerror();
 	gGL.getTexUnit(0)->activate();
 	glClientActiveTextureARB(GL_TEXTURE0_ARB);
 	stop_glerror();
diff --git a/indra/llrender/llglslshader.cpp b/indra/llrender/llglslshader.cpp
index 71d24bcf13..2dab757828 100644
--- a/indra/llrender/llglslshader.cpp
+++ b/indra/llrender/llglslshader.cpp
@@ -56,7 +56,7 @@ BOOL shouldChange(const LLVector4& v1, const LLVector4& v2)
 LLShaderFeatures::LLShaderFeatures()
 : calculatesLighting(false), isShiny(false), isFullbright(false), hasWaterFog(false),
 hasTransport(false), hasSkinning(false), hasObjectSkinning(false), hasAtmospherics(false), isSpecular(false),
-hasGamma(false), hasLighting(false), calculatesAtmospherics(false), disableTextureIndex(false)
+hasGamma(false), hasLighting(false), calculatesAtmospherics(false), mIndexedTextureChannels(0), disableTextureIndex(false)
 {
 }
 
@@ -107,16 +107,11 @@ BOOL LLGLSLShader::createShader(vector<string> * attributes,
 	// Create program
 	mProgramObject = glCreateProgramObjectARB();
 	
-	// Attach existing objects
-	if (!LLShaderMgr::instance()->attachShaderFeatures(this))
-	{
-		return FALSE;
-	}
-
+	//compile new source
 	vector< pair<string,GLenum> >::iterator fileIter = mShaderFiles.begin();
 	for ( ; fileIter != mShaderFiles.end(); fileIter++ )
 	{
-		GLhandleARB shaderhandle = LLShaderMgr::instance()->loadShaderFile((*fileIter).first, mShaderLevel, (*fileIter).second);
+		GLhandleARB shaderhandle = LLShaderMgr::instance()->loadShaderFile((*fileIter).first, mShaderLevel, (*fileIter).second, mFeatures.mIndexedTextureChannels);
 		LL_DEBUGS("ShaderLoading") << "SHADER FILE: " << (*fileIter).first << " mShaderLevel=" << mShaderLevel << LL_ENDL;
 		if (shaderhandle > 0)
 		{
@@ -128,6 +123,12 @@ BOOL LLGLSLShader::createShader(vector<string> * attributes,
 		}
 	}
 
+	// Attach existing objects
+	if (!LLShaderMgr::instance()->attachShaderFeatures(this))
+	{
+		return FALSE;
+	}
+
 	// Map attributes and uniforms
 	if (success)
 	{
@@ -149,6 +150,29 @@ BOOL LLGLSLShader::createShader(vector<string> * attributes,
 			return createShader(attributes,uniforms);
 		}
 	}
+	else if (mFeatures.mIndexedTextureChannels > 0)
+	{ //override texture channels for indexed texture rendering
+		bind();
+		S32 channel_count = mFeatures.mIndexedTextureChannels;
+
+		for (S32 i = 0; i < channel_count; i++)
+		{
+			uniform1i(llformat("tex%d", i), i);
+		}
+
+		S32 cur_tex = channel_count; //adjust any texture channels that might have been overwritten
+		for (U32 i = 0; i < mTexture.size(); i++)
+		{
+			if (mTexture[i] > -1 && mTexture[i] < channel_count)
+			{
+				llassert(cur_tex < gGLManager.mNumTextureImageUnits);
+				uniform1i(i, cur_tex);
+				mTexture[i] = cur_tex++;
+			}
+		}
+		unbind();
+	}
+
 	return success;
 }
 
diff --git a/indra/llrender/llglslshader.h b/indra/llrender/llglslshader.h
index 392688bba3..51be56b295 100644
--- a/indra/llrender/llglslshader.h
+++ b/indra/llrender/llglslshader.h
@@ -45,6 +45,7 @@ public:
 	bool hasObjectSkinning;
 	bool hasAtmospherics;
 	bool hasGamma;
+	S32 mIndexedTextureChannels;
 	bool disableTextureIndex;
 
 	// char numLights;
diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 0532510996..fdfcfe7fab 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -46,7 +46,7 @@ S32	gGLViewport[4];
 U32 LLRender::sUICalls = 0;
 U32 LLRender::sUIVerts = 0;
 
-static const U32 LL_NUM_TEXTURE_LAYERS = 16; 
+static const U32 LL_NUM_TEXTURE_LAYERS = 32; 
 static const U32 LL_NUM_LIGHT_UNITS = 8;
 
 static GLenum sGLTextureType[] =
diff --git a/indra/llrender/llshadermgr.cpp b/indra/llrender/llshadermgr.cpp
index 6fb1e6e437..e51ef8cfe7 100644
--- a/indra/llrender/llshadermgr.cpp
+++ b/indra/llrender/llshadermgr.cpp
@@ -216,9 +216,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightWaterF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightWaterF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}
 		
@@ -231,9 +235,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}		
 	}
@@ -251,9 +259,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightFullbrightShinyWaterF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightFullbrightShinyWaterF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}
 		else if (features->hasWaterFog)
@@ -265,9 +277,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightFullbrightWaterF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightFullbrightWaterF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}
 		
@@ -280,9 +296,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightFullbrightShinyF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightFullbrightShinyF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}
 		
@@ -295,9 +315,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightFullbrightF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightFullbrightF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}
 	}
@@ -315,9 +339,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightShinyWaterF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightShinyWaterF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}
 		
@@ -330,9 +358,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 					return FALSE;
 				}
 			}
-			else if (!shader->attachObject("lighting/lightShinyF.glsl"))
+			else 
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/lightShinyF.glsl"))
+				{
+					return FALSE;
+				}
+				shader->mFeatures.mIndexedTextureChannels = gGLManager.mNumTextureImageUnits-1;
 			}
 		}
 	}
@@ -376,7 +408,7 @@ void LLShaderMgr::dumpObjectLog(GLhandleARB ret, BOOL warns)
 	}
 }
 
-GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shader_level, GLenum type)
+GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shader_level, GLenum type, S32 texture_index_channels)
 {
 	GLenum error = GL_NO_ERROR;
 	if (gDebugGL)
@@ -430,6 +462,9 @@ GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shade
 	GLcharARB* text[1024];
 	GLuint count = 0;
 
+	//set version to 1.20
+	text[count++] = strdup("#version 120\n");
+
 	//copy preprocessor definitions into buffer
 	for (std::map<std::string,std::string>::iterator iter = mDefinitions.begin(); iter != mDefinitions.end(); ++iter)
 	{
@@ -437,6 +472,64 @@ GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shade
 		text[count++] = (GLcharARB *) strdup(define.c_str());
 	}
 
+	if (texture_index_channels > 0 && type == GL_FRAGMENT_SHADER_ARB)
+	{
+		//use specified number of texture channels for indexed texture rendering
+
+		/* prepend shader code that looks like this:
+
+		uniform sampler2D tex0;
+		uniform sampler2D tex1;
+		uniform sampler2D tex2;
+		.
+		.
+		.
+		uniform sampler2D texN;
+		
+		varying float vary_texture_index;
+
+		vec4 diffuseLookup(vec2 texcoord)
+		{
+			switch (int(vary_texture_index+0.25))
+			{
+				case 0: return texture2D(tex0, texcoord);
+				case 1: return texture2D(tex1, texcoord);
+				case 2: return texture2D(tex2, texcoord);
+				.
+				.
+				.
+				case N: return texture2D(texN, texcoord);
+			}
+
+			return vec4(0,0,0,0);
+		}
+		*/
+
+		//uniform declartion
+		for (S32 i = 0; i < texture_index_channels; ++i)
+		{
+			std::string decl = llformat("uniform sampler2D tex%d;\n", i);
+			text[count++] = strdup(decl.c_str());
+		}
+
+		text[count++] = strdup("varying float vary_texture_index;\n");
+		text[count++] = strdup("vec4 diffuseLookup(vec2 texcoord)\n");
+		text[count++] = strdup("{\n");
+		text[count++] = strdup("\tswitch (int(vary_texture_index+0.25))\n");
+		text[count++] = strdup("\t{\n");
+		
+		//switch body
+		for (S32 i = 0; i < texture_index_channels; ++i)
+		{
+			std::string case_str = llformat("\t\tcase %d: return texture2D(tex%d, texcoord);\n", i, i);
+			text[count++] = strdup(case_str.c_str());
+		}
+
+		text[count++] = strdup("\t}\n");
+		text[count++] = strdup("\treturn vec4(0,0,0,0);\n");
+		text[count++] = strdup("}\n");
+	}
+
 	//copy file into memory
 	while( fgets((char *)buff, 1024, file) != NULL && count < LL_ARRAY_SIZE(buff) ) 
 	{
@@ -519,7 +612,7 @@ GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shade
 		if (shader_level > 1)
 		{
 			shader_level--;
-			return loadShaderFile(filename,shader_level,type);
+			return loadShaderFile(filename,shader_level,type,texture_index_channels);
 		}
 		LL_WARNS("ShaderLoading") << "Failed to load " << filename << LL_ENDL;	
 	}
diff --git a/indra/llrender/llshadermgr.h b/indra/llrender/llshadermgr.h
index 9ee11b98c8..2f30103811 100644
--- a/indra/llrender/llshadermgr.h
+++ b/indra/llrender/llshadermgr.h
@@ -43,7 +43,7 @@ public:
 	void dumpObjectLog(GLhandleARB ret, BOOL warns = TRUE);
 	BOOL	linkProgramObject(GLhandleARB obj, BOOL suppress_errors = FALSE);
 	BOOL	validateProgramObject(GLhandleARB obj);
-	GLhandleARB loadShaderFile(const std::string& filename, S32 & shader_level, GLenum type);
+	GLhandleARB loadShaderFile(const std::string& filename, S32 & shader_level, GLenum type, S32 texture_index_channels = -1);
 
 	// Implemented in the application to actually point to the shader directory.
 	virtual std::string getShaderDirPrefix(void) = 0; // Pure Virtual