1 files changed, 142 insertions, 0 deletions
diff --git a/libs/hwui/Program.cpp b/libs/hwui/Program.cpp
new file mode 100644
index 0000000..6528d91
--- /dev/null
+++ b/libs/hwui/Program.cpp
@@ -0,0 +1,142 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "OpenGLRenderer"
+
+#include "Program.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Shaders
+///////////////////////////////////////////////////////////////////////////////
+
+#define SHADER_SOURCE(name, source) const char* name = #source
+
+///////////////////////////////////////////////////////////////////////////////
+// Base program
+///////////////////////////////////////////////////////////////////////////////
+
+Program::Program(const char* vertex, const char* fragment) {
+    vertexShader = buildShader(vertex, GL_VERTEX_SHADER);
+    fragmentShader = buildShader(fragment, GL_FRAGMENT_SHADER);
+
+    id = glCreateProgram();
+    glAttachShader(id, vertexShader);
+    glAttachShader(id, fragmentShader);
+    glLinkProgram(id);
+
+    GLint status;
+    glGetProgramiv(id, GL_LINK_STATUS, &status);
+    if (status != GL_TRUE) {
+        GLint infoLen = 0;
+        glGetProgramiv(id, GL_INFO_LOG_LENGTH, &infoLen);
+        if (infoLen > 1) {
+            char* log = (char*) malloc(sizeof(char) * infoLen);
+            glGetProgramInfoLog(id, infoLen, 0, log);
+            LOGE("Error while linking shaders: %s", log);
+            delete log;
+        }
+        glDeleteShader(vertexShader);
+        glDeleteShader(fragmentShader);
+        glDeleteProgram(id);
+    }
+
+    mUse = false;
+
+    position = addAttrib("position");
+    color = addUniform("color");
+    transform = addUniform("transform");
+}
+
+Program::~Program() {
+    glDeleteShader(vertexShader);
+    glDeleteShader(fragmentShader);
+    glDeleteProgram(id);
+}
+
+int Program::addAttrib(const char* name) {
+    int slot = glGetAttribLocation(id, name);
+    attributes.add(name, slot);
+    return slot;
+}
+
+int Program::getAttrib(const char* name) {
+    ssize_t index = attributes.indexOfKey(name);
+    if (index >= 0) {
+        return attributes.valueAt(index);
+    }
+    return addAttrib(name);
+}
+
+int Program::addUniform(const char* name) {
+    int slot = glGetUniformLocation(id, name);
+    uniforms.add(name, slot);
+    return slot;
+}
+
+int Program::getUniform(const char* name) {
+    ssize_t index = uniforms.indexOfKey(name);
+    if (index >= 0) {
+        return uniforms.valueAt(index);
+    }
+    return addUniform(name);
+}
+
+GLuint Program::buildShader(const char* source, GLenum type) {
+    GLuint shader = glCreateShader(type);
+    glShaderSource(shader, 1, &source, 0);
+    glCompileShader(shader);
+
+    GLint status;
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
+    if (status != GL_TRUE) {
+        // Some drivers return wrong values for GL_INFO_LOG_LENGTH
+        // use a fixed size instead
+        GLchar log[512];
+        glGetShaderInfoLog(shader, sizeof(log), 0, &log[0]);
+        LOGE("Error while compiling shader: %s", log);
+        glDeleteShader(shader);
+    }
+
+    return shader;
+}
+
+void Program::set(const mat4& projectionMatrix, const mat4& modelViewMatrix,
+        const mat4& transformMatrix) {
+    mat4 t(projectionMatrix);
+    t.multiply(transformMatrix);
+    t.multiply(modelViewMatrix);
+
+    glUniformMatrix4fv(transform, 1, GL_FALSE, &t.data[0]);
+}
+
+void Program::use() {
+    glUseProgram(id);
+    mUse = true;
+
+    glEnableVertexAttribArray(position);
+}
+
+void Program::remove() {
+    mUse = false;
+
+    glDisableVertexAttribArray(position);
+}
+
+}; // namespace uirenderer
+}; // namespace android