Generate shaders to cover all possible cases.
With this change, all the vertex and fragment shaders used by the GL
renderer are now generated based on a program description supplied
by the caller. This allows the renderer to generate a large number
of shaders without having to write all the possible combinations by
hand. The generated shaders are stored in a program cache.
Change-Id: If54d286e77ae021c724d42090da476df12a18ebb
diff --git a/libs/hwui/ProgramCache.h b/libs/hwui/ProgramCache.h
new file mode 100644
index 0000000..7f2f5fa
--- /dev/null
+++ b/libs/hwui/ProgramCache.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_UI_PROGRAM_CACHE_H
+#define ANDROID_UI_PROGRAM_CACHE_H
+
+#include <utils/KeyedVector.h>
+#include <utils/Log.h>
+
+#include <SkXfermode.h>
+
+#include "Program.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Defines
+///////////////////////////////////////////////////////////////////////////////
+
+// Debug
+#define DEBUG_PROGRAM_CACHE 0
+
+// Debug
+#if DEBUG_PROGRAM_CACHE
+ #define PROGRAM_LOGD(...) LOGD(__VA_ARGS__)
+#else
+ #define PROGRAM_LOGD(...)
+#endif
+
+#define PROGRAM_KEY_TEXTURE 0x1
+#define PROGRAM_KEY_A8_TEXTURE 0x2
+#define PROGRAM_KEY_BITMAP 0x4
+#define PROGRAM_KEY_GRADIENT 0x8
+#define PROGRAM_KEY_BITMAP_FIRST 0x10
+#define PROGRAM_KEY_COLOR_MATRIX 0x20
+#define PROGRAM_KEY_COLOR_LIGHTING 0x40
+#define PROGRAM_KEY_COLOR_BLEND 0x80
+
+// Support only the 12 Porter-Duff modes for now
+#define PROGRAM_MAX_XFERMODE 0xC
+#define PROGRAM_XFERMODE_SHADER_SHIFT 24
+#define PROGRAM_XFERMODE_COLOR_OP_SHIFT 20
+
+///////////////////////////////////////////////////////////////////////////////
+// Types
+///////////////////////////////////////////////////////////////////////////////
+
+typedef uint32_t programid;
+
+///////////////////////////////////////////////////////////////////////////////
+// Cache
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Describe the features required for a given program. The features
+ * determine the generation of both the vertex and fragment shaders.
+ * A ProgramDescription must be used in conjunction with a ProgramCache.
+ */
+struct ProgramDescription {
+ enum ColorModifier {
+ kColorNone,
+ kColorMatrix,
+ kColorLighting,
+ kColorBlend
+ };
+
+ ProgramDescription():
+ hasTexture(false), hasAlpha8Texture(false),
+ hasBitmap(false), hasGradient(false), shadersMode(SkXfermode::kClear_Mode),
+ colorOp(kColorNone), colorMode(SkXfermode::kClear_Mode) {
+ }
+
+ // Texturing
+ bool hasTexture;
+ bool hasAlpha8Texture;
+
+ // Shaders
+ bool hasBitmap;
+ bool hasGradient;
+ SkXfermode::Mode shadersMode;
+ bool isBitmapFirst;
+
+ // Color operations
+ int colorOp;
+ SkXfermode::Mode colorMode;
+
+ programid key() const {
+ programid key = 0;
+ if (hasTexture) key |= PROGRAM_KEY_TEXTURE;
+ if (hasAlpha8Texture) key |= PROGRAM_KEY_A8_TEXTURE;
+ if (hasBitmap) key |= PROGRAM_KEY_BITMAP;
+ if (hasGradient) key |= PROGRAM_KEY_GRADIENT;
+ if (isBitmapFirst) key |= PROGRAM_KEY_BITMAP_FIRST;
+ if (hasBitmap && hasGradient) {
+ key |= (shadersMode & PROGRAM_MAX_XFERMODE) << PROGRAM_XFERMODE_SHADER_SHIFT;
+ }
+ switch (colorOp) {
+ case kColorMatrix:
+ key |= PROGRAM_KEY_COLOR_MATRIX;
+ break;
+ case kColorLighting:
+ key |= PROGRAM_KEY_COLOR_LIGHTING;
+ break;
+ case kColorBlend:
+ key |= PROGRAM_KEY_COLOR_BLEND;
+ key |= (colorMode & PROGRAM_MAX_XFERMODE) << PROGRAM_XFERMODE_COLOR_OP_SHIFT;
+ break;
+ case kColorNone:
+ break;
+ }
+ return key;
+ }
+}; // struct ProgramDescription
+
+/**
+ * Generates and caches program. Programs are generated based on
+ * ProgramDescriptions.
+ */
+class ProgramCache {
+public:
+ ProgramCache();
+ ~ProgramCache();
+
+ Program* get(const ProgramDescription& description);
+
+ void clear();
+
+private:
+ Program* generateProgram(const ProgramDescription& description, programid key);
+ String8 generateVertexShader(const ProgramDescription& description);
+ String8 generateFragmentShader(const ProgramDescription& description);
+ void generatePorterDuffBlend(String8& shader, const char* name, SkXfermode::Mode mode);
+
+ KeyedVector<programid, Program*> mCache;
+
+}; // class ProgramCache
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_PROGRAM_CACHE_H