Move GPU gradients into src/effects/gradients.
Review URL: https://codereview.appspot.com/6453055
git-svn-id: http://skia.googlecode.com/svn/trunk@4805 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkGradientShaderPriv.h b/src/effects/gradients/SkGradientShaderPriv.h
index 49249b5..23de48c 100644
--- a/src/effects/gradients/SkGradientShaderPriv.h
+++ b/src/effects/gradients/SkGradientShaderPriv.h
@@ -18,9 +18,9 @@
#include "SkTemplates.h"
#include "SkBitmapCache.h"
#include "SkShader.h"
-#include "effects/GrGradientEffects.h"
#include "GrSamplerState.h"
#include "SkGr.h"
+#include "gl/GrGLProgramStage.h"
#ifndef SK_DISABLE_DITHER_32BIT_GRADIENT
#define USE_DITHER_32BIT_GRADIENT
@@ -189,5 +189,76 @@
typedef SkShader INHERITED;
};
+///////////////////////////////////////////////////////////////////////////////
+
+class GrSamplerState;
+class GrProgramStageFactory;
+
+/*
+ * The intepretation of the texture matrix depends on the sample mode. The
+ * texture matrix is applied both when the texture coordinates are explicit
+ * and when vertex positions are used as texture coordinates. In the latter
+ * case the texture matrix is applied to the pre-view-matrix position
+ * values.
+ *
+ * Normal SampleMode
+ * The post-matrix texture coordinates are in normalize space with (0,0) at
+ * the top-left and (1,1) at the bottom right.
+ * RadialGradient
+ * The matrix specifies the radial gradient parameters.
+ * (0,0) in the post-matrix space is center of the radial gradient.
+ * Radial2Gradient
+ * Matrix transforms to space where first circle is centered at the
+ * origin. The second circle will be centered (x, 0) where x may be
+ * 0 and is provided by setRadial2Params. The post-matrix space is
+ * normalized such that 1 is the second radius - first radius.
+ * SweepGradient
+ * The angle from the origin of texture coordinates in post-matrix space
+ * determines the gradient value.
+ */
+
+// Base class for Gr gradient effects
+class GrGradientEffect : public GrCustomStage {
+public:
+
+ GrGradientEffect(GrTexture* texture);
+ GrGradientEffect(GrContext* ctx, const SkShader& shader,
+ GrSamplerState* sampler);
+
+ virtual ~GrGradientEffect();
+
+ unsigned int numTextures() const;
+ GrTexture* texture(unsigned int index) const;
+
+ bool useTexture() const { return fUseTexture; }
+
+private:
+
+ GrTexture* fTexture;
+ bool fUseTexture;
+
+ typedef GrCustomStage INHERITED;
+
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+// Base class for GL gradient custom stages
+class GrGLGradientStage : public GrGLProgramStage {
+public:
+
+ GrGLGradientStage(const GrProgramStageFactory& factory);
+ virtual ~GrGLGradientStage();
+
+ // emit code that gets a fragment's color from an expression for t; for now
+ // this always uses the texture, but for simpler cases we'll be able to lerp
+ void emitColorLookup(GrGLShaderBuilder* builder, const char* t,
+ const char* outputColor, const char* samplerName);
+
+private:
+
+ typedef GrGLProgramStage INHERITED;
+};
+
#endif