Refactor blending and texture gl state
Change-Id: Ia6b3c8b2afd3dfcee7f3ce401d846b789612054a
diff --git a/libs/hwui/renderstate/TextureState.cpp b/libs/hwui/renderstate/TextureState.cpp
new file mode 100644
index 0000000..1a638d2
--- /dev/null
+++ b/libs/hwui/renderstate/TextureState.cpp
@@ -0,0 +1,103 @@
+/*
+ * 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/TextureState.h>
+
+namespace android {
+namespace uirenderer {
+
+// Must define as many texture units as specified by kTextureUnitsCount
+const GLenum kTextureUnits[] = {
+ GL_TEXTURE0,
+ GL_TEXTURE1,
+ GL_TEXTURE2
+};
+
+TextureState::TextureState()
+ : mTextureUnit(0) {
+ glActiveTexture(kTextureUnits[0]);
+ resetBoundTextures();
+
+ GLint maxTextureUnits;
+ glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
+ LOG_ALWAYS_FATAL_IF(maxTextureUnits < kTextureUnitsCount,
+ "At least %d texture units are required!", kTextureUnitsCount);
+}
+
+void TextureState::activateTexture(GLuint textureUnit) {
+ if (mTextureUnit != textureUnit) {
+ glActiveTexture(kTextureUnits[textureUnit]);
+ mTextureUnit = textureUnit;
+ }
+}
+
+void TextureState::resetActiveTexture() {
+ mTextureUnit = -1;
+}
+
+void TextureState::bindTexture(GLuint texture) {
+ if (mBoundTextures[mTextureUnit] != texture) {
+ glBindTexture(GL_TEXTURE_2D, texture);
+ mBoundTextures[mTextureUnit] = texture;
+ }
+}
+
+void TextureState::bindTexture(GLenum target, GLuint texture) {
+ if (target == GL_TEXTURE_2D) {
+ bindTexture(texture);
+ } else {
+ // GLConsumer directly calls glBindTexture() with
+ // target=GL_TEXTURE_EXTERNAL_OES, don't cache this target
+ // since the cached state could be stale
+ glBindTexture(target, texture);
+ }
+}
+
+void TextureState::deleteTexture(GLuint texture) {
+ // When glDeleteTextures() is called on a currently bound texture,
+ // OpenGL ES specifies that the texture is then considered unbound
+ // Consider the following series of calls:
+ //
+ // glGenTextures -> creates texture name 2
+ // glBindTexture(2)
+ // glDeleteTextures(2) -> 2 is now unbound
+ // glGenTextures -> can return 2 again
+ //
+ // If we don't call glBindTexture(2) after the second glGenTextures
+ // call, any texture operation will be performed on the default
+ // texture (name=0)
+
+ unbindTexture(texture);
+
+ glDeleteTextures(1, &texture);
+}
+
+void TextureState::resetBoundTextures() {
+ for (int i = 0; i < kTextureUnitsCount; i++) {
+ mBoundTextures[i] = 0;
+ }
+}
+
+void TextureState::unbindTexture(GLuint texture) {
+ for (int i = 0; i < kTextureUnitsCount; i++) {
+ if (mBoundTextures[i] == texture) {
+ mBoundTextures[i] = 0;
+ }
+ }
+}
+
+} /* namespace uirenderer */
+} /* namespace android */
+