Added getMaxRenderTargets() to Renderer, for a runtime-specific value for the…

src/libGLESv2/renderer/Renderer.h

@@ -181,6 +181,8 @@ class Renderer
 
     virtual GLsizei getMaxSupportedSamples() const = 0;
 
+    virtual unsigned int getMaxRenderTargets() const = 0;
+
     // Pixel operations
     virtual bool copyToRenderTarget(TextureStorageInterface2D *dest, TextureStorageInterface2D *source) = 0;
     virtual bool copyToRenderTarget(TextureStorageInterfaceCube *dest, TextureStorageInterfaceCube *source) = 0;

src/libGLESv2/renderer/Renderer11.cpp

@@ -2357,6 +2357,21 @@ int Renderer11::getNearestSupportedSamples(DXGI_FORMAT format, unsigned int requ
     return -1;
 }
 
+unsigned int Renderer11::getMaxRenderTargets() const
+{
+    switch (mFeatureLevel)
+    {
+      case D3D_FEATURE_LEVEL_11_0:
+        return D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT;  // 8
+      case D3D_FEATURE_LEVEL_10_1:
+      case D3D_FEATURE_LEVEL_10_0:
+        return D3D10_SIMULTANEOUS_RENDER_TARGET_COUNT;  // 8
+      default:
+        UNREACHABLE();
+        return 1;
+    }
+}
+
 bool Renderer11::copyToRenderTarget(TextureStorageInterface2D *dest, TextureStorageInterface2D *source)
 {
     if (source && dest)

src/libGLESv2/renderer/Renderer11.h

@@ -125,6 +125,8 @@ class Renderer11 : public Renderer
     virtual GLsizei getMaxSupportedSamples() const;
     int getNearestSupportedSamples(DXGI_FORMAT format, unsigned int requested) const;
 
+    virtual unsigned int getMaxRenderTargets() const;
+
     // Pixel operations
     virtual bool copyToRenderTarget(TextureStorageInterface2D *dest, TextureStorageInterface2D *source);
     virtual bool copyToRenderTarget(TextureStorageInterfaceCube *dest, TextureStorageInterfaceCube *source);

src/libGLESv2/renderer/Renderer9.cpp

@@ -2408,6 +2408,12 @@ int Renderer9::getNearestSupportedSamples(D3DFORMAT format, int requested) const
     return -1;
 }
 
+unsigned int Renderer9::getMaxRenderTargets() const
+{
+    // we do not support MRT in d3d9
+    return 1;
+}
+
 D3DFORMAT Renderer9::ConvertTextureInternalFormat(GLint internalformat)
 {
     switch (internalformat)

src/libGLESv2/renderer/Renderer9.h

@@ -146,6 +146,8 @@ class Renderer9 : public Renderer
     virtual GLsizei getMaxSupportedSamples() const;
     int getNearestSupportedSamples(D3DFORMAT format, int requested) const;
     
+    virtual unsigned int getMaxRenderTargets() const;
+
     D3DFORMAT ConvertTextureInternalFormat(GLint internalformat);
 
     // Pixel operations