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 <memory> 2368f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik#include <SkCanvas.h> 2468f5b8a7810a011a068db3390c714bf02f3072c6Chris Craik#include <SkBitmap.h> 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 3344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikconst GLenum kTextureUnits[] = { 3444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik GL_TEXTURE0, 3544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik GL_TEXTURE1, 36e310f83d591dc3fb7bd5c684239481a586f00662Chris Craik GL_TEXTURE2, 37e310f83d591dc3fb7bd5c684239481a586f00662Chris Craik GL_TEXTURE3 3844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik}; 3944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 4044eb2c00861098dd3e2950d923646814b4cc57c2Chris CraikTextureState::TextureState() 4144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik : mTextureUnit(0) { 4244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glActiveTexture(kTextureUnits[0]); 4344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik resetBoundTextures(); 4444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 4544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik GLint maxTextureUnits; 4644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits); 4744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik LOG_ALWAYS_FATAL_IF(maxTextureUnits < kTextureUnitsCount, 48e310f83d591dc3fb7bd5c684239481a586f00662Chris Craik "At least %d texture units are required!", kTextureUnitsCount); 492de7771740ee08fcaff638ec6b2e460bb72fff04John Reck glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 5044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 5144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 52138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris CraikTextureState::~TextureState() { 53138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik if (mShadowLutTexture != nullptr) { 54138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->deleteTexture(); 55138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik } 56138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik} 57138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 58138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik/** 59138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * Maps shadow geometry 'alpha' varying (1 for darkest, 0 for transparent) to 60138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * darkness at that spot. Input values of 0->1 should be mapped within the same 61138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * range, but can affect the curve for a different visual falloff. 62138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * 63138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * This is used to populate the shadow LUT texture for quick lookup in the 64138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik * shadow shader. 65138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik */ 66138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craikstatic float computeShadowOpacity(float ratio) { 67138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik // exponential falloff function provided by UX 68138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik float val = 1 - ratio; 69138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik return exp(-val * val * 4.0) - 0.018; 70138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik} 71138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 72138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craikvoid TextureState::constructTexture(Caches& caches) { 73138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik if (mShadowLutTexture == nullptr) { 74138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture.reset(new Texture(caches)); 75138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 76138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik unsigned char bytes[SHADOW_LUT_SIZE]; 77138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik for (int i = 0; i < SHADOW_LUT_SIZE; i++) { 78138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik float inputRatio = i / (SHADOW_LUT_SIZE - 1.0f); 79138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik bytes[i] = computeShadowOpacity(inputRatio) * 255; 80138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik } 81138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->upload(GL_ALPHA, SHADOW_LUT_SIZE, 1, GL_ALPHA, GL_UNSIGNED_BYTE, &bytes); 82138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->setFilter(GL_LINEAR); 83138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik mShadowLutTexture->setWrap(GL_CLAMP_TO_EDGE); 84138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik } 85138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik} 86138c21fbec12bead3c7ca1f181c3fd35542ccb00Chris Craik 8744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::activateTexture(GLuint textureUnit) { 88e310f83d591dc3fb7bd5c684239481a586f00662Chris Craik LOG_ALWAYS_FATAL_IF(textureUnit >= kTextureUnitsCount, 89e310f83d591dc3fb7bd5c684239481a586f00662Chris Craik "Tried to use texture unit index %d, only %d exist", 90e310f83d591dc3fb7bd5c684239481a586f00662Chris Craik textureUnit, kTextureUnitsCount); 9144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (mTextureUnit != textureUnit) { 9244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glActiveTexture(kTextureUnits[textureUnit]); 9344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mTextureUnit = textureUnit; 9444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 9544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 9644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 9744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::resetActiveTexture() { 9844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mTextureUnit = -1; 9944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 10044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 10144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::bindTexture(GLuint texture) { 10244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (mBoundTextures[mTextureUnit] != texture) { 10344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glBindTexture(GL_TEXTURE_2D, texture); 10444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mBoundTextures[mTextureUnit] = texture; 10544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 10644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 10744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 10844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::bindTexture(GLenum target, GLuint texture) { 10944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (target == GL_TEXTURE_2D) { 11044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik bindTexture(texture); 11144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } else { 11244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // GLConsumer directly calls glBindTexture() with 11344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // target=GL_TEXTURE_EXTERNAL_OES, don't cache this target 11444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // since the cached state could be stale 11544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glBindTexture(target, texture); 11644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 11744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 11844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 11944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::deleteTexture(GLuint texture) { 12044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // When glDeleteTextures() is called on a currently bound texture, 12144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // OpenGL ES specifies that the texture is then considered unbound 12244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // Consider the following series of calls: 12344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // 12444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glGenTextures -> creates texture name 2 12544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glBindTexture(2) 12644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glDeleteTextures(2) -> 2 is now unbound 12744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // glGenTextures -> can return 2 again 12844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // 12944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // If we don't call glBindTexture(2) after the second glGenTextures 13044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // call, any texture operation will be performed on the default 13144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik // texture (name=0) 13244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 13344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik unbindTexture(texture); 13444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 13544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik glDeleteTextures(1, &texture); 13644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 13744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 13844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::resetBoundTextures() { 13944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik for (int i = 0; i < kTextureUnitsCount; i++) { 14044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mBoundTextures[i] = 0; 14144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 14244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 14344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 14444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craikvoid TextureState::unbindTexture(GLuint texture) { 14544eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik for (int i = 0; i < kTextureUnitsCount; i++) { 14644eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik if (mBoundTextures[i] == texture) { 14744eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik mBoundTextures[i] = 0; 14844eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 14944eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik } 15044eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} 15144eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 15244eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} /* namespace uirenderer */ 15344eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik} /* namespace android */ 15444eb2c00861098dd3e2950d923646814b4cc57c2Chris Craik 155