commit a5aed0d58962a24c44728ffc46dc9e1ba2f9fda5
author Romain Guy <romainguy@google.com> Thu Sep 09 14:42:43 2010 -0700
committer Romain Guy <romainguy@google.com> Thu Sep 09 14:42:43 2010 -0700
tree 4194d14711b2cba0e8192e5f1c0764f530bc7309
parent d90f23e24a4d1768d5a7ed0e7072e67af6330a45

Add support for advanced blend modes with the framebuffer.

This adds the ability to blend with the framebuffer using Darken,
Lighten, Add, Multiply, Overlay and Screen.

Change-Id: Iae01a53797d4ad39c373cba6ff2a42293129da1a

libs/hwui/ProgramCache.h

diff --git a/libs/hwui/ProgramCache.h b/libs/hwui/ProgramCache.h
index f211ab6..8f5304d 100644
--- a/libs/hwui/ProgramCache.h
+++ b/libs/hwui/ProgramCache.h
@@ -35,7 +35,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 // Debug
-#define DEBUG_PROGRAM_CACHE 0
+#define DEBUG_PROGRAM_CACHE 1
 
 // Debug
 #if DEBUG_PROGRAM_CACHE
@@ -61,6 +61,7 @@
 #define PROGRAM_MAX_XFERMODE 0x1f
 #define PROGRAM_XFERMODE_SHADER_SHIFT 26
 #define PROGRAM_XFERMODE_COLOR_OP_SHIFT 20
+#define PROGRAM_XFERMODE_FRAMEBUFFER_SHIFT 14
 
 #define PROGRAM_BITMAP_WRAPS_SHIFT 9
 #define PROGRAM_BITMAP_WRAPT_SHIFT 11
@@ -93,7 +94,8 @@
         hasBitmap(false), isBitmapNpot(false), hasGradient(false),
         shadersMode(SkXfermode::kClear_Mode), isBitmapFirst(false),
         bitmapWrapS(GL_CLAMP_TO_EDGE), bitmapWrapT(GL_CLAMP_TO_EDGE),
-        colorOp(kColorNone), colorMode(SkXfermode::kClear_Mode) {
+        colorOp(kColorNone), colorMode(SkXfermode::kClear_Mode),
+        framebufferMode(SkXfermode::kClear_Mode) {
     }
 
     // Texturing
@@ -113,6 +115,10 @@
     int colorOp;
     SkXfermode::Mode colorMode;
 
+    // Framebuffer blending (requires Extensions.hasFramebufferFetch())
+    // Ignored for all values < SkXfermode::kPlus_Mode
+    SkXfermode::Mode framebufferMode;
+
     inline uint32_t getEnumForWrap(GLenum wrap) const {
         switch (wrap) {
             case GL_CLAMP_TO_EDGE:
@@ -156,6 +162,7 @@
             case kColorNone:
                 break;
         }
+        key |= (framebufferMode & PROGRAM_MAX_XFERMODE) << PROGRAM_XFERMODE_FRAMEBUFFER_SHIFT;
         return key;
     }
 }; // struct ProgramDescription