Add multitexture support to text and path shaders

This does not add additional textures to the atlases, just adds the
ability to access those textures in the shaders.

Bug: skia:3550
Change-Id: I636b329a6f748b6753f5f92a70066fb412623df2
Reviewed-on: https://skia-review.googlesource.com/43000
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>

1 files changed, 15 insertions, 16 deletions

diff --git a/src/gpu/effects/GrBitmapTextGeoProc.cpp b/src/gpu/effects/GrBitmapTextGeoProc.cpp
index c2cf8ebc22..fab0904a4f 100644
--- a/src/gpu/effects/GrBitmapTextGeoProc.cpp
+++ b/src/gpu/effects/GrBitmapTextGeoProc.cpp
@@ -7,6 +7,7 @@
 
 #include "GrBitmapTextGeoProc.h"
 
+#include "GrAtlasedShaderHelpers.h"
 #include "GrTexture.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLGeometryProcessor.h"
@@ -36,12 +37,11 @@ public:
                                                           "AtlasSizeInv",
                                                           &atlasSizeInvName);
 
-        GrGLSLVertToFrag v(kVec2f_GrSLType);
-        varyingHandler->addVarying("TextureCoords", &v, kHigh_GrSLPrecision);
-        vertBuilder->codeAppendf("%s = float2(%s.x, %s.y) * %s;", v.vsOut(),
-                                 btgp.inTextureCoords()->fName,
-                                 btgp.inTextureCoords()->fName,
-                                 atlasSizeInvName);
+        GrGLSLVertToFrag uv(kVec2f_GrSLType);
+        GrGLSLVertToFrag st(kVec2f_GrSLType);
+        GrGLSLVertToFrag texIdx(kFloat_GrSLType);
+        append_index_uv_varyings(args, btgp.inTextureCoords()->fName, atlasSizeInvName,
+                                 &uv, &st, &texIdx);
 
         GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
         // Setup pass through color
@@ -64,18 +64,16 @@ public:
                              btgp.localMatrix(),
                              args.fFPCoordTransformHandler);
 
+        fragBuilder->codeAppend("float4 texColor;");
+        append_multitexture_lookup(args, btgp.numTextureSamplers(),
+                                   texIdx, uv.fsIn(), "texColor");
+
         if (btgp.maskFormat() == kARGB_GrMaskFormat) {
-            fragBuilder->codeAppendf("%s = ", args.fOutputColor);
-            fragBuilder->appendTextureLookupAndModulate(args.fOutputColor,
-                                                        args.fTexSamplers[0],
-                                                        v.fsIn(),
-                                                        kVec2f_GrSLType);
-            fragBuilder->codeAppend(";");
+            // modulate by color
+            fragBuilder->codeAppendf("%s = %s * texColor;", args.fOutputColor, args.fOutputColor);
             fragBuilder->codeAppendf("%s = float4(1);", args.fOutputCoverage);
         } else {
-            fragBuilder->codeAppendf("%s = ", args.fOutputCoverage);
-            fragBuilder->appendTextureLookup(args.fTexSamplers[0], v.fsIn(), kVec2f_GrSLType);
-            fragBuilder->codeAppend(";");
+            fragBuilder->codeAppendf("%s = texColor;", args.fOutputCoverage);
         }
     }
 
@@ -89,7 +87,7 @@ public:
             fColor = btgp.color();
         }
 
-        SkASSERT(btgp.numTextureSamplers() == 1);
+        SkASSERT(btgp.numTextureSamplers() >= 1);
         GrTexture* atlas = btgp.textureSampler(0).peekTexture();
         SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height()));
 
@@ -108,6 +106,7 @@ public:
         key |= (btgp.usesLocalCoords() && btgp.localMatrix().hasPerspective()) ? 0x1 : 0x0;
         key |= btgp.maskFormat() << 1;
         b->add32(key);
+        b->add32(btgp.numTextureSamplers());
     }
 
 private: