Fix clearing all samples of multisample render targets.

Only libGLESv2 was clearing all the samples of a multisample buffer.
Since all known APIs always clear all the samples, this could be
handled in the Renderer.

Bug swiftshader:77

Change-Id: Ib9adc3c61d263420ed0a0ae4828a693bd360b076
Reviewed-on: https://swiftshader-review.googlesource.com/10788
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>

src/Renderer/Renderer.cpp

diff --git a/src/Renderer/Renderer.cpp b/src/Renderer/Renderer.cpp
index 7afbb9f..252d744 100644
--- a/src/Renderer/Renderer.cpp
+++ b/src/Renderer/Renderer.cpp
@@ -672,9 +672,15 @@
 		}
 	}
 
-	void Renderer::clear(void *pixel, Format format, Surface *dest, const SliceRect &dRect, unsigned int rgbaMask)
+	void Renderer::clear(void *value, Format format, Surface *dest, const Rect &clearRect, unsigned int rgbaMask)
 	{
-		blitter->clear(pixel, format, dest, dRect, rgbaMask);
+		SliceRect rect = clearRect;
+		int samples = dest->getDepth();
+
+		for(rect.slice = 0; rect.slice < samples; rect.slice++)
+		{
+			blitter->clear(value, format, dest, rect, rgbaMask);
+		}
 	}
 
 	void Renderer::blit(Surface *source, const SliceRect &sRect, Surface *dest, const SliceRect &dRect, bool filter, bool isStencil)

src/Renderer/Renderer.hpp

diff --git a/src/Renderer/Renderer.hpp b/src/Renderer/Renderer.hpp
index dedd17a..d796475 100644
--- a/src/Renderer/Renderer.hpp
+++ b/src/Renderer/Renderer.hpp
@@ -326,7 +326,7 @@
 
 		void draw(DrawType drawType, unsigned int indexOffset, unsigned int count, bool update = true);
 
-		void clear(void* pixel, Format format, Surface *dest, const SliceRect &dRect, unsigned int rgbaMask);
+		void clear(void *value, Format format, Surface *dest, const Rect &rect, unsigned int rgbaMask);
 		void blit(Surface *source, const SliceRect &sRect, Surface *dest, const SliceRect &dRect, bool filter, bool isStencil = false);
 		void blit3D(Surface *source, Surface *dest);
 

src/Renderer/Surface.cpp

diff --git a/src/Renderer/Surface.cpp b/src/Renderer/Surface.cpp
index 1a63ff9..6bcc657 100644
--- a/src/Renderer/Surface.cpp
+++ b/src/Renderer/Surface.cpp
@@ -3193,14 +3193,14 @@
 		resource->unlock();
 	}
 
-	bool Surface::isEntire(const SliceRect& rect) const
+	bool Surface::isEntire(const Rect& rect) const
 	{
 		return (rect.x0 == 0 && rect.y0 == 0 && rect.x1 == internal.width && rect.y1 == internal.height && internal.depth == 1);
 	}
 
-	SliceRect Surface::getRect() const
+	Rect Surface::getRect() const
 	{
-		return SliceRect(0, 0, internal.width, internal.height, 0);
+		return Rect(0, 0, internal.width, internal.height);
 	}
 
 	void Surface::clearDepth(float depth, int x0, int y0, int width, int height)

src/Renderer/Surface.hpp

diff --git a/src/Renderer/Surface.hpp b/src/Renderer/Surface.hpp
index b54565e..6418c08 100644
--- a/src/Renderer/Surface.hpp
+++ b/src/Renderer/Surface.hpp
@@ -299,8 +299,8 @@
 		inline int getMultiSampleCount() const;
 		inline int getSuperSampleCount() const;
 
-		bool isEntire(const SliceRect& rect) const;
-		SliceRect getRect() const;
+		bool isEntire(const Rect& rect) const;
+		Rect getRect() const;
 		void clearDepth(float depth, int x0, int y0, int width, int height);
 		void clearStencil(unsigned char stencil, unsigned char mask, int x0, int y0, int width, int height);
 		void fill(const Color<float> &color, int x0, int y0, int width, int height);