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Diffstat (limited to 'libs/hwui/Program.h')
-rw-r--r-- | libs/hwui/Program.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/libs/hwui/Program.h b/libs/hwui/Program.h new file mode 100644 index 0000000..ee16a92 --- /dev/null +++ b/libs/hwui/Program.h @@ -0,0 +1,156 @@ +/* + * 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_H +#define ANDROID_UI_PROGRAM_H + +#include <GLES2/gl2.h> +#include <GLES2/gl2ext.h> + +#include <utils/KeyedVector.h> +#include <utils/RefBase.h> + +namespace android { +namespace uirenderer { + +/** + * A program holds a vertex and a fragment shader. It offers several utility + * methods to query attributes and uniforms. + */ +class Program: public LightRefBase<Program> { +public: + /** + * Creates a new program with the specified vertex and fragment + * shaders sources. + */ + Program(const char* vertex, const char* fragment); + ~Program(); + + /** + * Binds this program to the GL context. + */ + void use(); + +protected: + /** + * Adds an attribute with the specified name. + * + * @return The OpenGL name of the attribute. + */ + int addAttrib(const char* name); + /** + * Returns the OpenGL name of the specified attribute. + */ + int getAttrib(const char* name); + + /** + * Adds a uniform with the specified name. + * + * @return The OpenGL name of the uniform. + */ + int addUniform(const char* name); + /** + * Returns the OpenGL name of the specified uniform. + */ + int getUniform(const char* name); + +private: + /** + * Compiles the specified shader of the specified type. + * + * @return The name of the compiled shader. + */ + GLuint buildShader(const char* source, GLenum type); + + // Name of the OpenGL program + GLuint id; + + // Name of the shaders + GLuint vertexShader; + GLuint fragmentShader; + + // Keeps track of attributes and uniforms slots + KeyedVector<const char*, int> attributes; + KeyedVector<const char*, int> uniforms; +}; // class Program + +/** + * Program used to draw vertices with a simple color. The shaders must + * specify the following attributes: + * vec4 position, position of the vertex + * vec4 color, RGBA color of the vertex + * + * And the following uniforms: + * mat4 projection, the projection matrix + * mat4 modelView, the modelView matrix + * mat4 transform, an extra transformation matrix + */ +class DrawColorProgram: public Program { +public: + DrawColorProgram(); + DrawColorProgram(const char* vertex, const char* fragment); + + /** + * Binds the program with the specified projection, modelView and + * transform matrices. + */ + void use(const GLfloat* projectionMatrix, const GLfloat* modelViewMatrix, + const GLfloat* transformMatrix); + + /** + * Name of the position attribute. + */ + int position; + /** + * Name of the color attribute. + */ + int color; + + /** + * Name of the projection uniform. + */ + int projection; + /** + * Name of the modelView uniform. + */ + int modelView; + /** + * Name of the transform uniform. + */ + int transform; + +protected: + void getAttribsAndUniforms(); +}; + +/** + * Program used to draw textured vertices. In addition to everything that the + * DrawColorProgram supports, the following two attributes must be specified: + * sampler2D sampler, the texture sampler + * vec2 texCoords, the texture coordinates of the vertex + */ +class DrawTextureProgram: public DrawColorProgram { +public: + DrawTextureProgram(); + + int sampler; + int texCoords; +}; + +}; // namespace uirenderer +}; // namespace android + +#endif // ANDROID_UI_PROGRAM_H |