144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik/* 244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * Copyright (C) 2015 The Android Open Source Project 344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * 444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * Licensed under the Apache License, Version 2.0 (the "License"); 544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * you may not use this file except in compliance with the License. 644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * You may obtain a copy of the License at 744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * 844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * http://www.apache.org/licenses/LICENSE-2.0 944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * 1044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * Unless required by applicable law or agreed to in writing, software 1144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * distributed under the License is distributed on an "AS IS" BASIS, 1244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * See the License for the specific language governing permissions and 1444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik * limitations under the License. 1544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik */ 16f27133df2d179c99d6bc1ae644af09e9153a0071Chris Craik#include "renderstate/TextureState.h" 1744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 1868f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik#include "Caches.h" 1968f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik#include "utils/TraceUtils.h" 2068f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik 2168f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik#include <GLES3/gl3.h> 2268f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik#include <SkBitmap.h> 231bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John Reck#include <SkCanvas.h> 241bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John Reck#include <memory> 2568f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik 2644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craiknamespace android { 2744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craiknamespace uirenderer { 2844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 29138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik// Width of mShadowLutTexture, defines how accurate the shadow alpha lookup table is 30138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craikstatic const int SHADOW_LUT_SIZE = 128; 31138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 3244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik// Must define as many texture units as specified by kTextureUnitsCount 331bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John Reckconst GLenum kTextureUnits[] = {GL_TEXTURE0, GL_TEXTURE1, GL_TEXTURE2, GL_TEXTURE3}; 341bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John Reck 351bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John ReckTextureState::TextureState() : mTextureUnit(0) { 3644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glActiveTexture(kTextureUnits[0]); 3744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik resetBoundTextures(); 3844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 3944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik GLint maxTextureUnits; 4044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits); 4144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik LOG_ALWAYS_FATAL_IF(maxTextureUnits < kTextureUnitsCount, 421bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John Reck "At least %d texture units are required!", kTextureUnitsCount); 432de7771740ee08fcaff638ec6b2e460bb72fff04John Reck glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 4444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 4544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 46138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris CraikTextureState::~TextureState() { 47138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik if (mShadowLutTexture != nullptr) { 48138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->deleteTexture(); 49138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik } 50138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik} 51138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 52138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik/** 53138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * Maps shadow geometry 'alpha' varying (1 for darkest, 0 for transparent) to 54138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * darkness at that spot. Input values of 0->1 should be mapped within the same 55138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * range, but can affect the curve for a different visual falloff. 56138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * 57138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * This is used to populate the shadow LUT texture for quick lookup in the 58138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * shadow shader. 59138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik */ 60138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craikstatic float computeShadowOpacity(float ratio) { 61138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik // exponential falloff function provided by UX 62138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik float val = 1 - ratio; 63138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik return exp(-val * val * 4.0) - 0.018; 64138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik} 65138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 66138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craikvoid TextureState::constructTexture(Caches& caches) { 67138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik if (mShadowLutTexture == nullptr) { 68138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture.reset(new Texture(caches)); 69138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 70138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik unsigned char bytes[SHADOW_LUT_SIZE]; 71138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik for (int i = 0; i < SHADOW_LUT_SIZE; i++) { 72138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik float inputRatio = i / (SHADOW_LUT_SIZE - 1.0f); 73138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik bytes[i] = computeShadowOpacity(inputRatio) * 255; 74138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik } 75138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->upload(GL_ALPHA, SHADOW_LUT_SIZE, 1, GL_ALPHA, GL_UNSIGNED_BYTE, &bytes); 76138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->setFilter(GL_LINEAR); 77138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->setWrap(GL_CLAMP_TO_EDGE); 78138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik } 79138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik} 80138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 8144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::activateTexture(GLuint textureUnit) { 82e310f83d591dc3fb7bd5c684239481a586f00662Chris Craik LOG_ALWAYS_FATAL_IF(textureUnit >= kTextureUnitsCount, 831bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John Reck "Tried to use texture unit index %d, only %d exist", textureUnit, 841bcacfdcab0eaa0cee92bd7f5a1b5e271dd68e52John Reck kTextureUnitsCount); 8544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (mTextureUnit != textureUnit) { 8644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glActiveTexture(kTextureUnits[textureUnit]); 8744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mTextureUnit = textureUnit; 8844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 8944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 9044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 9144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::resetActiveTexture() { 9244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mTextureUnit = -1; 9344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 9444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 9544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::bindTexture(GLuint texture) { 9644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (mBoundTextures[mTextureUnit] != texture) { 9744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glBindTexture(GL_TEXTURE_2D, texture); 9844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mBoundTextures[mTextureUnit] = texture; 9944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 10044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 10144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 10244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::bindTexture(GLenum target, GLuint texture) { 10344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (target == GL_TEXTURE_2D) { 10444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik bindTexture(texture); 10544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } else { 10644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // GLConsumer directly calls glBindTexture() with 10744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // target=GL_TEXTURE_EXTERNAL_OES, don't cache this target 10844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // since the cached state could be stale 10944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glBindTexture(target, texture); 11044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 11144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 11244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 11344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::deleteTexture(GLuint texture) { 11444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // When glDeleteTextures() is called on a currently bound texture, 11544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // OpenGL ES specifies that the texture is then considered unbound 11644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // Consider the following series of calls: 11744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // 11844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glGenTextures -> creates texture name 2 11944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glBindTexture(2) 12044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glDeleteTextures(2) -> 2 is now unbound 12144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glGenTextures -> can return 2 again 12244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // 12344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // If we don't call glBindTexture(2) after the second glGenTextures 12444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // call, any texture operation will be performed on the default 12544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // texture (name=0) 12644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 12744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik unbindTexture(texture); 12844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 12944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glDeleteTextures(1, &texture); 13044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 13144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 13244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::resetBoundTextures() { 13344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik for (int i = 0; i < kTextureUnitsCount; i++) { 13444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mBoundTextures[i] = 0; 13544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 13644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 13744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 13844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::unbindTexture(GLuint texture) { 13944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik for (int i = 0; i < kTextureUnitsCount; i++) { 14044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (mBoundTextures[i] == texture) { 14144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mBoundTextures[i] = 0; 14244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 14344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 14444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 14544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 14644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} /* namespace uirenderer */ 14744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} /* namespace android */ 148