1 files changed, 175 insertions, 0 deletions
diff --git a/libs/hwui/renderstate/MeshState.cpp b/libs/hwui/renderstate/MeshState.cpp
new file mode 100644
index 0000000..0521f65
--- /dev/null
+++ b/libs/hwui/renderstate/MeshState.cpp
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+#include "renderstate/MeshState.h"
+
+#include "Program.h"
+
+#include "ShadowTessellator.h"
+
+namespace android {
+namespace uirenderer {
+
+MeshState::MeshState()
+        : mCurrentIndicesBuffer(0)
+        , mCurrentPixelBuffer(0)
+        , mCurrentPositionPointer(this)
+        , mCurrentPositionStride(0)
+        , mCurrentTexCoordsPointer(this)
+        , mCurrentTexCoordsStride(0)
+        , mTexCoordsArrayEnabled(false)
+        , mQuadListIndices(0) {
+    glGenBuffers(1, &mUnitQuadBuffer);
+    glBindBuffer(GL_ARRAY_BUFFER, mUnitQuadBuffer);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(kUnitQuadVertices), kUnitQuadVertices, GL_STATIC_DRAW);
+
+    mCurrentBuffer = mUnitQuadBuffer;
+
+    uint16_t regionIndices[kMaxNumberOfQuads * 6];
+    for (uint32_t i = 0; i < kMaxNumberOfQuads; i++) {
+        uint16_t quad = i * 4;
+        int index = i * 6;
+        regionIndices[index    ] = quad;       // top-left
+        regionIndices[index + 1] = quad + 1;   // top-right
+        regionIndices[index + 2] = quad + 2;   // bottom-left
+        regionIndices[index + 3] = quad + 2;   // bottom-left
+        regionIndices[index + 4] = quad + 1;   // top-right
+        regionIndices[index + 5] = quad + 3;   // bottom-right
+    }
+    glGenBuffers(1, &mQuadListIndices);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mQuadListIndices);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(regionIndices), regionIndices, GL_STATIC_DRAW);
+    mCurrentIndicesBuffer = mQuadListIndices;
+
+    // position attribute always enabled
+    glEnableVertexAttribArray(Program::kBindingPosition);
+}
+
+MeshState::~MeshState() {
+    glDeleteBuffers(1, &mUnitQuadBuffer);
+    mCurrentBuffer = 0;
+
+    glDeleteBuffers(1, &mQuadListIndices);
+    mQuadListIndices = 0;
+}
+
+void MeshState::dump() {
+    ALOGD("MeshState VBOs: unitQuad %d, current %d", mUnitQuadBuffer, mCurrentBuffer);
+    ALOGD("MeshState IBOs: quadList %d, current %d", mQuadListIndices, mCurrentIndicesBuffer);
+    ALOGD("MeshState vertices: vertex data %p, stride %d",
+            mCurrentPositionPointer, mCurrentPositionStride);
+    ALOGD("MeshState texCoord: data %p, stride %d",
+            mCurrentTexCoordsPointer, mCurrentTexCoordsStride);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Buffer Objects
+///////////////////////////////////////////////////////////////////////////////
+
+bool MeshState::bindMeshBuffer() {
+    return bindMeshBuffer(mUnitQuadBuffer);
+}
+
+bool MeshState::bindMeshBuffer(GLuint buffer) {
+    if (!buffer) buffer = mUnitQuadBuffer;
+    return bindMeshBufferInternal(buffer);
+}
+
+bool MeshState::unbindMeshBuffer() {
+    return bindMeshBufferInternal(0);
+}
+
+bool MeshState::bindMeshBufferInternal(GLuint buffer) {
+    if (mCurrentBuffer != buffer) {
+        glBindBuffer(GL_ARRAY_BUFFER, buffer);
+        mCurrentBuffer = buffer;
+        return true;
+    }
+    return false;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Vertices
+///////////////////////////////////////////////////////////////////////////////
+
+void MeshState::bindPositionVertexPointer(bool force, const GLvoid* vertices, GLsizei stride) {
+    if (force || vertices != mCurrentPositionPointer || stride != mCurrentPositionStride) {
+        glVertexAttribPointer(Program::kBindingPosition, 2, GL_FLOAT, GL_FALSE, stride, vertices);
+        mCurrentPositionPointer = vertices;
+        mCurrentPositionStride = stride;
+    }
+}
+
+void MeshState::bindTexCoordsVertexPointer(bool force, const GLvoid* vertices, GLsizei stride) {
+    if (force || vertices != mCurrentTexCoordsPointer || stride != mCurrentTexCoordsStride) {
+        glVertexAttribPointer(Program::kBindingTexCoords, 2, GL_FLOAT, GL_FALSE, stride, vertices);
+        mCurrentTexCoordsPointer = vertices;
+        mCurrentTexCoordsStride = stride;
+    }
+}
+
+void MeshState::resetVertexPointers() {
+    mCurrentPositionPointer = this;
+    mCurrentTexCoordsPointer = this;
+}
+
+void MeshState::resetTexCoordsVertexPointer() {
+    mCurrentTexCoordsPointer = this;
+}
+
+void MeshState::enableTexCoordsVertexArray() {
+    if (!mTexCoordsArrayEnabled) {
+        glEnableVertexAttribArray(Program::kBindingTexCoords);
+        mCurrentTexCoordsPointer = this;
+        mTexCoordsArrayEnabled = true;
+    }
+}
+
+void MeshState::disableTexCoordsVertexArray() {
+    if (mTexCoordsArrayEnabled) {
+        glDisableVertexAttribArray(Program::kBindingTexCoords);
+        mTexCoordsArrayEnabled = false;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Indices
+///////////////////////////////////////////////////////////////////////////////
+
+bool MeshState::bindIndicesBufferInternal(const GLuint buffer) {
+    if (mCurrentIndicesBuffer != buffer) {
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer);
+        mCurrentIndicesBuffer = buffer;
+        return true;
+    }
+    return false;
+}
+
+bool MeshState::bindQuadIndicesBuffer() {
+    return bindIndicesBufferInternal(mQuadListIndices);
+}
+
+bool MeshState::unbindIndicesBuffer() {
+    if (mCurrentIndicesBuffer) {
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+        mCurrentIndicesBuffer = 0;
+        return true;
+    }
+    return false;
+}
+
+} /* namespace uirenderer */
+} /* namespace android */
+