Fix compilation warnings.

src/common/version.h

 #define MAJOR_VERSION 0
 #define MINOR_VERSION 0
 #define BUILD_VERSION 0
-#define BUILD_REVISION 644
+#define BUILD_REVISION 645
 
 #define STRINGIFY(x) #x
 #define MACRO_STRINGIFY(x) STRINGIFY(x)

src/libGLESv2/Context.cpp

@@ -729,7 +729,7 @@ void Context::setDepthMask(bool mask)
     }
 }
 
-void Context::setActiveSampler(int active)
+void Context::setActiveSampler(unsigned int active)
 {
     mState.activeSampler = active;
 }
@@ -2943,12 +2943,12 @@ int Context::getMaximumVaryingVectors() const
     return mSupportsShaderModel3 ? MAX_VARYING_VECTORS_SM3 : MAX_VARYING_VECTORS_SM2;
 }
 
-int Context::getMaximumVertexTextureImageUnits() const
+unsigned int Context::getMaximumVertexTextureImageUnits() const
 {
     return mSupportsVertexTexture ? MAX_VERTEX_TEXTURE_IMAGE_UNITS_VTF : 0;
 }
 
-int Context::getMaximumCombinedTextureImageUnits() const
+unsigned int Context::getMaximumCombinedTextureImageUnits() const
 {
     return MAX_TEXTURE_IMAGE_UNITS + getMaximumVertexTextureImageUnits();
 }

src/libGLESv2/Context.h

@@ -206,7 +206,7 @@ struct State
     bool colorMaskAlpha;
     bool depthMask;
 
-    int activeSampler;   // Active texture unit selector - GL_TEXTURE0
+    unsigned int activeSampler;   // Active texture unit selector - GL_TEXTURE0
     BindingPointer<Buffer> arrayBuffer;
     BindingPointer<Buffer> elementArrayBuffer;
     GLuint readFramebuffer;
@@ -323,7 +323,7 @@ class Context
     void setColorMask(bool red, bool green, bool blue, bool alpha);
     void setDepthMask(bool mask);
 
-    void setActiveSampler(int active);
+    void setActiveSampler(unsigned int active);
 
     GLuint getReadFramebufferHandle() const;
     GLuint getDrawFramebufferHandle() const;
@@ -426,8 +426,8 @@ class Context
 
     bool supportsShaderModel3() const;
     int getMaximumVaryingVectors() const;
-    int getMaximumVertexTextureImageUnits() const;
-    int getMaximumCombinedTextureImageUnits() const;
+    unsigned int getMaximumVertexTextureImageUnits() const;
+    unsigned int getMaximumCombinedTextureImageUnits() const;
     int getMaximumFragmentUniformVectors() const;
     int getMaximumRenderbufferDimension() const;
     int getMaximumTextureDimension() const;

src/libGLESv2/Program.cpp

@@ -195,7 +195,7 @@ int Program::getSemanticIndex(int attributeIndex)
 // index (0-15 for the pixel shader and 0-3 for the vertex shader).
 GLint Program::getSamplerMapping(SamplerType type, unsigned int samplerIndex)
 {
-    GLint logicalTextureUnit = -1;
+    GLuint logicalTextureUnit = -1;
 
     switch (type)
     {
@@ -2863,7 +2863,7 @@ bool Program::validateSamplers(bool logErrors)
     // texture image unit, and this is the current program, then ValidateProgram will fail, and
     // DrawArrays and DrawElements will issue the INVALID_OPERATION error.
 
-    const int maxCombinedTextureImageUnits = getContext()->getMaximumCombinedTextureImageUnits();
+    const unsigned int maxCombinedTextureImageUnits = getContext()->getMaximumCombinedTextureImageUnits();
     TextureType textureUnitType[MAX_COMBINED_TEXTURE_IMAGE_UNITS_VTF];
 
     for (unsigned int i = 0; i < MAX_COMBINED_TEXTURE_IMAGE_UNITS_VTF; ++i)
@@ -2875,9 +2875,9 @@ bool Program::validateSamplers(bool logErrors)
     {
         if (mSamplersPS[i].active)
         {
-            int unit = mSamplersPS[i].logicalTextureUnit;
+            unsigned int unit = mSamplersPS[i].logicalTextureUnit;
             
-            if (unit < 0 || unit >= maxCombinedTextureImageUnits)
+            if (unit >= maxCombinedTextureImageUnits)
             {
                 if (logErrors)
                 {
@@ -2910,9 +2910,9 @@ bool Program::validateSamplers(bool logErrors)
     {
         if (mSamplersVS[i].active)
         {
-            int unit = mSamplersVS[i].logicalTextureUnit;
+            unsigned int unit = mSamplersVS[i].logicalTextureUnit;
             
-            if (unit < 0 || unit >= maxCombinedTextureImageUnits)
+            if (unit >= maxCombinedTextureImageUnits)
             {
                 if (logErrors)
                 {