1 files changed, 252 insertions, 0 deletions
diff --git a/Runtime/GfxDevice/opengl/ChannelsGL.cpp b/Runtime/GfxDevice/opengl/ChannelsGL.cpp
new file mode 100644
index 0000000..3b4f275
--- /dev/null
+++ b/Runtime/GfxDevice/opengl/ChannelsGL.cpp
@@ -0,0 +1,252 @@
+#include "UnityPrefix.h"
+#include "ChannelsGL.h"
+#include "Runtime/GfxDevice/ChannelAssigns.h"
+#include "UnityGL.h"
+#include "Runtime/Shaders/GraphicsCaps.h"
+#include "GLAssert.h"
+
+// dimensionality of the different channels (element count)
+static const int kDefaultChannelSizes[kShaderChannelCount] = {
+	3, // pos
+	3, // normal
+	4, // color
+	2, // uv
+	2, // uv2
+	4, // tangent
+};
+
+static const GLenum kDefaultChannelTypes[kShaderChannelCount] = {
+	GL_FLOAT, // pos
+	GL_FLOAT, // normal
+	GL_UNSIGNED_BYTE, // color
+	GL_FLOAT, // UV0
+	GL_FLOAT, // UV1
+	GL_FLOAT, // tangent
+};
+
+
+static void SetVertexComponentData( VertexComponent comp, int size, unsigned int type, int stride, const void *pointer )
+{
+	// We allow pointer to be used as an offset
+	//DebugAssertIf( !pointer );
+
+	switch (comp) {
+	case kVertexCompColor:
+		OGL_CALL(glColorPointer (size, type, stride, pointer));
+		break;
+	case kVertexCompVertex:
+		OGL_CALL(glVertexPointer (size, type, stride, pointer));
+		break;
+	case kVertexCompNormal:
+		DebugAssert( size >= 3 );
+		OGL_CALL(glNormalPointer (type, stride, pointer));
+		break;
+	case kVertexCompTexCoord0:
+	case kVertexCompTexCoord1:
+	case kVertexCompTexCoord2:
+	case kVertexCompTexCoord3:
+	case kVertexCompTexCoord4:
+	case kVertexCompTexCoord5:
+	case kVertexCompTexCoord6:
+	case kVertexCompTexCoord7:
+		if (gGraphicsCaps.maxTexCoords > 1) {
+			OGL_CALL(glClientActiveTextureARB( GL_TEXTURE0_ARB + comp - kVertexCompTexCoord0 ));
+		}
+		OGL_CALL(glTexCoordPointer (size, type, stride, pointer));
+		break;
+	case kVertexCompTexCoord:
+		printf_console( "Warning: unspecified texcoord bound\n" );
+		break;
+	case kVertexCompAttrib0: case kVertexCompAttrib1: case kVertexCompAttrib2: case kVertexCompAttrib3:
+	case kVertexCompAttrib4: case kVertexCompAttrib5: case kVertexCompAttrib6: case kVertexCompAttrib7:
+	case kVertexCompAttrib8: case kVertexCompAttrib9: case kVertexCompAttrib10: case kVertexCompAttrib11:
+	case kVertexCompAttrib12: case kVertexCompAttrib13: case kVertexCompAttrib14: case kVertexCompAttrib15:
+		OGL_CALL(glVertexAttribPointerARB( comp - kVertexCompAttrib0, size, type, true, stride, pointer ));
+		break;
+	}
+}
+
+static signed char s_EnabledVertexComps[kVertexCompCount]; // 0/1 or -1 if unknown
+static unsigned int s_EnabledTargetsMask; // Bitfield of which targets are currently valid
+
+void ClearActiveChannelsGL()
+{
+	s_EnabledTargetsMask = 0;
+}
+
+static UInt32 GetGLType(const ChannelInfo& source)
+{
+	switch (source.format)
+	{
+		case kChannelFormatFloat:	return GL_FLOAT;
+		case kChannelFormatFloat16:	return GL_HALF_FLOAT_ARB;
+		case kChannelFormatColor:	return GL_UNSIGNED_BYTE;
+		case kChannelFormatByte:	return GL_BYTE;
+	}
+	ErrorString("Unknown channel format!");
+	return 0;
+}
+
+static int GetGLDimension(const ChannelInfo& source)
+{
+	return (source.format == kChannelFormatColor) ? 4 : source.dimension;
+}
+
+void SetChannelDataGL( const ChannelInfo& source, const StreamInfoArray streams, VertexComponent target, const UInt8* buffer )
+{
+	AssertIf( target == kVertexCompNone || target == kVertexCompTexCoord );
+	int stride = source.CalcStride( streams );
+	int offset = source.CalcOffset( streams );
+	SetVertexComponentData( target, GetGLDimension(source), GetGLType(source), stride, buffer + offset );
+	s_EnabledTargetsMask |= (1 << target);
+}
+
+void SetChannelDataGL( ShaderChannel source, VertexComponent target, const void *pointer, int stride )
+{
+	AssertIf( source == kShaderChannelNone );
+	if( !pointer )
+		return;
+
+	DebugAssertIf( target == kVertexCompNone || target == kVertexCompTexCoord );
+	SetVertexComponentData( target, kDefaultChannelSizes[source], kDefaultChannelTypes[source], stride, pointer );
+	s_EnabledTargetsMask |= (1 << target);
+}
+
+#if UNITY_EDITOR
+// only used by GizmoUtil in the editor
+void SetChannelDataGL( ShaderChannel source, const ChannelAssigns& channels, const void *pointer, int stride )
+{
+	AssertIf( source == kShaderChannelNone );
+	if( !pointer )
+		return;
+
+	for( int i = 0; i < kVertexCompCount; ++i )
+	{
+		if( channels.GetSourceForTarget( (VertexComponent)i ) == source )
+		{
+			AssertIf( i == kVertexCompNone || i == kVertexCompTexCoord );
+			SetVertexComponentData( (VertexComponent)i, kDefaultChannelSizes[source], kDefaultChannelTypes[source], stride, pointer );
+			s_EnabledTargetsMask |= (1 << i);
+		}
+	}
+}
+
+#endif
+
+
+void ActivateChannelsGL()
+{
+	unsigned int compMask = s_EnabledTargetsMask;
+	int i;
+
+	// fetch now to prevent aliasing
+	GLint vaCount = gGraphicsCaps.gl.vertexAttribCount;
+	//GLint texUnitCount = gGraphicsCaps.maxTexUnits;
+	GLint texCoordCount = gGraphicsCaps.maxTexCoords;
+
+	static GLenum gltargets[] = { 0, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_NORMAL_ARRAY };
+
+	// There's a dark corner of GL spec that says that generic and conventional vertex
+	// attributes (and arrays) may be aliased (most decent drivers don't alias them).
+	// http://oss.sgi.com/projects/ogl-sample/registry/NV/vertex_program.txt
+	//
+	// So we first disable all vertex components that we don't use; then enable all
+	// that we do use. This should work both in aliased and non-aliased implementations.
+	//
+	// On some systems (XP, Catalyst 5.7, R9600) this makes a difference!
+	// Without it e.g. a single GUIText is not visible.
+
+	// --------------------------------
+	// First disable components we don't use
+
+	for( i = kVertexCompVertex; i <= kVertexCompNormal; ++i )
+	{
+		if( !(compMask & (1<<i)) )
+		{
+			if( s_EnabledVertexComps[i] != 0 )
+			{
+				OGL_CALL(glDisableClientState( gltargets[i] ));
+				s_EnabledVertexComps[i] = 0;
+			}
+		}
+	}
+
+	for( i = 0; i < texCoordCount; ++i )
+	{
+		int compIndex = kVertexCompTexCoord0 + i;
+		if( !(compMask & (1 << compIndex)) )
+		{
+			if( s_EnabledVertexComps[compIndex] != 0 )
+			{
+				if( texCoordCount > 1 )
+					OGL_CALL(glClientActiveTextureARB(GL_TEXTURE0_ARB + i));
+				OGL_CALL(glDisableClientState (GL_TEXTURE_COORD_ARRAY));
+				s_EnabledVertexComps[compIndex] = 0;
+			}
+		}
+	}
+
+	for( i = 0; i < vaCount; ++i )
+	{
+		int compIndex = kVertexCompAttrib0 + i;
+		if( !(compMask & (1 << compIndex)) )
+		{
+			if( s_EnabledVertexComps[compIndex] != 0 )
+			{
+				OGL_CALL(glDisableVertexAttribArrayARB (i));
+				s_EnabledVertexComps[compIndex] = 0;
+			}
+		}
+	}
+
+	// --------------------------------
+	// Then enable components we use
+
+	for( i = kVertexCompVertex; i <= kVertexCompNormal; ++i )
+	{
+		if( compMask & (1<<i) )
+		{
+			if( s_EnabledVertexComps[i] != 1 )
+			{
+				OGL_CALL(glEnableClientState( gltargets[i] ));
+				s_EnabledVertexComps[i] = 1;
+			}
+		}
+	}
+
+	for( i = 0; i < texCoordCount; ++i )
+	{
+		int compIndex = kVertexCompTexCoord0 + i;
+		if( compMask & (1 << compIndex) )
+		{
+			if( s_EnabledVertexComps[compIndex] != 1 )
+			{
+				if( texCoordCount > 1 )
+					OGL_CALL(glClientActiveTextureARB(GL_TEXTURE0_ARB + i));
+				OGL_CALL(glEnableClientState (GL_TEXTURE_COORD_ARRAY));
+				s_EnabledVertexComps[compIndex] = 1;
+			}
+		}
+	}
+
+	for( i = 0; i < vaCount; ++i )
+	{
+		int compIndex = kVertexCompAttrib0 + i;
+		if( compMask & (1 << compIndex) )
+		{
+			if( s_EnabledVertexComps[compIndex] != 1 )
+			{
+				OGL_CALL(glEnableVertexAttribArrayARB( i ));
+				s_EnabledVertexComps[compIndex] = 1;
+			}
+		}
+	}
+
+	GLAssert();
+}
+
+void InvalidateChannelStateGL()
+{
+	for( int i = 0; i < kVertexCompCount; ++i )
+		s_EnabledVertexComps[i] = -1;
+}