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      1 /*
      2  * Copyright 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <GLES/gl.h>
     18 #include <GLES/glext.h>
     19 
     20 #include <utils/String8.h>
     21 #include <cutils/compiler.h>
     22 
     23 #include "GLES11RenderEngine.h"
     24 #include "Mesh.h"
     25 #include "Texture.h"
     26 
     27 // ---------------------------------------------------------------------------
     28 namespace android {
     29 // ---------------------------------------------------------------------------
     30 
     31 GLES11RenderEngine::GLES11RenderEngine() {
     32 
     33     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
     34     glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
     35 
     36     glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
     37     glPixelStorei(GL_PACK_ALIGNMENT, 4);
     38     glEnableClientState(GL_VERTEX_ARRAY);
     39     glShadeModel(GL_FLAT);
     40     glDisable(GL_DITHER);
     41     glDisable(GL_CULL_FACE);
     42 
     43     struct pack565 {
     44         inline uint16_t operator() (int r, int g, int b) const {
     45             return (r<<11)|(g<<5)|b;
     46         }
     47     } pack565;
     48 
     49     const uint16_t protTexData[] = { 0 };
     50     glGenTextures(1, &mProtectedTexName);
     51     glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
     52     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     53     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     54     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     55     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     56     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
     57             GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
     58 }
     59 
     60 GLES11RenderEngine::~GLES11RenderEngine() {
     61 }
     62 
     63 
     64 size_t GLES11RenderEngine::getMaxTextureSize() const {
     65     return mMaxTextureSize;
     66 }
     67 
     68 size_t GLES11RenderEngine::getMaxViewportDims() const {
     69     return
     70         mMaxViewportDims[0] < mMaxViewportDims[1] ?
     71             mMaxViewportDims[0] : mMaxViewportDims[1];
     72 }
     73 
     74 void GLES11RenderEngine::setViewportAndProjection(
     75         size_t vpw, size_t vph, size_t w, size_t h, bool yswap) {
     76     glViewport(0, 0, vpw, vph);
     77     glMatrixMode(GL_PROJECTION);
     78     glLoadIdentity();
     79     // put the origin in the left-bottom corner
     80     if (yswap)  glOrthof(0, w, h, 0, 0, 1);
     81     else        glOrthof(0, w, 0, h, 0, 1);
     82     glMatrixMode(GL_MODELVIEW);
     83 }
     84 
     85 void GLES11RenderEngine::setupLayerBlending(
     86     bool premultipliedAlpha, bool opaque, int alpha) {
     87     GLenum combineRGB;
     88     GLenum combineAlpha;
     89     GLenum src0Alpha;
     90     GLfloat envColor[4];
     91 
     92     if (CC_UNLIKELY(alpha < 0xFF)) {
     93         // Cv = premultiplied ? Cs*alpha : Cs
     94         // Av = !opaque       ? As*alpha : As
     95         combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
     96         combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
     97         src0Alpha    = GL_CONSTANT;
     98         envColor[0]  = alpha * (1.0f / 255.0f);
     99     } else {
    100         // Cv = Cs
    101         // Av = opaque ? 1.0 : As
    102         combineRGB   = GL_REPLACE;
    103         combineAlpha = GL_REPLACE;
    104         src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
    105         envColor[0]  = 1.0f;
    106     }
    107 
    108     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
    109     glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
    110     glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
    111     glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
    112     if (combineRGB == GL_MODULATE) {
    113         glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
    114         glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
    115     }
    116     glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
    117     glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
    118     glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
    119     if (combineAlpha == GL_MODULATE) {
    120         glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
    121         glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
    122     }
    123     if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
    124         envColor[1] = envColor[0];
    125         envColor[2] = envColor[0];
    126         envColor[3] = envColor[0];
    127         glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
    128     }
    129 
    130     if (alpha < 0xFF || !opaque) {
    131         glEnable(GL_BLEND);
    132         glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
    133                     GL_ONE_MINUS_SRC_ALPHA);
    134     } else {
    135         glDisable(GL_BLEND);
    136     }
    137 }
    138 
    139 void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
    140     glDisable(GL_TEXTURE_EXTERNAL_OES);
    141     glDisable(GL_TEXTURE_2D);
    142     if (alpha == 0xFF) {
    143         glDisable(GL_BLEND);
    144     } else {
    145         glEnable(GL_BLEND);
    146         glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
    147     }
    148     glColor4f(0, 0, 0, alpha/255.0f);
    149 }
    150 
    151 void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
    152     GLuint target = texture.getTextureTarget();
    153     glBindTexture(target, texture.getTextureName());
    154     GLenum filter = GL_NEAREST;
    155     if (texture.getFiltering()) {
    156         filter = GL_LINEAR;
    157     }
    158     glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    159     glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    160     glTexParameterx(target, GL_TEXTURE_MAG_FILTER, filter);
    161     glTexParameterx(target, GL_TEXTURE_MIN_FILTER, filter);
    162     glMatrixMode(GL_TEXTURE);
    163     glLoadMatrixf(texture.getMatrix().asArray());
    164     glMatrixMode(GL_MODELVIEW);
    165     glDisable(GL_TEXTURE_2D);
    166     glEnable(GL_TEXTURE_EXTERNAL_OES);
    167 }
    168 
    169 void GLES11RenderEngine::setupLayerBlackedOut() {
    170     glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
    171     glMatrixMode(GL_TEXTURE);
    172     glLoadIdentity();
    173     glMatrixMode(GL_MODELVIEW);
    174     glDisable(GL_TEXTURE_EXTERNAL_OES);
    175     glEnable(GL_TEXTURE_2D);
    176 }
    177 
    178 void GLES11RenderEngine::disableTexturing() {
    179     glDisable(GL_TEXTURE_EXTERNAL_OES);
    180     glDisable(GL_TEXTURE_2D);
    181 }
    182 
    183 void GLES11RenderEngine::disableBlending() {
    184     glDisable(GL_BLEND);
    185 }
    186 
    187 void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
    188         uint32_t* texName, uint32_t* fbName, uint32_t* status) {
    189     GLuint tname, name;
    190     // turn our EGLImage into a texture
    191     glGenTextures(1, &tname);
    192     glBindTexture(GL_TEXTURE_2D, tname);
    193     glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
    194 
    195     // create a Framebuffer Object to render into
    196     glGenFramebuffersOES(1, &name);
    197     glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
    198     glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
    199             GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
    200 
    201     *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
    202     *texName = tname;
    203     *fbName = name;
    204 }
    205 
    206 void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
    207     glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
    208     glDeleteFramebuffersOES(1, &fbName);
    209     glDeleteTextures(1, &texName);
    210 }
    211 
    212 void GLES11RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
    213     glColor4f(r, g, b, a);
    214     glDisable(GL_TEXTURE_EXTERNAL_OES);
    215     glDisable(GL_TEXTURE_2D);
    216     glDisable(GL_BLEND);
    217 }
    218 
    219 void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
    220     if (mesh.getTexCoordsSize()) {
    221         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    222         glTexCoordPointer(mesh.getTexCoordsSize(),
    223                 GL_FLOAT,
    224                 mesh.getByteStride(),
    225                 mesh.getTexCoords());
    226     }
    227 
    228     glVertexPointer(mesh.getVertexSize(),
    229             GL_FLOAT,
    230             mesh.getByteStride(),
    231             mesh.getPositions());
    232 
    233     glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
    234 
    235     if (mesh.getTexCoordsSize()) {
    236         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    237     }
    238 }
    239 
    240 void GLES11RenderEngine::beginGroup(const mat4& colorTransform) {
    241     // doesn't do anything in GLES 1.1
    242 }
    243 
    244 void GLES11RenderEngine::endGroup() {
    245     // doesn't do anything in GLES 1.1
    246 }
    247 
    248 void GLES11RenderEngine::dump(String8& result) {
    249     RenderEngine::dump(result);
    250 }
    251 
    252 // ---------------------------------------------------------------------------
    253 }; // namespace android
    254 // ---------------------------------------------------------------------------
    255 
    256 #if defined(__gl2_h_)
    257 #error "don't include gl2/gl2.h in this file"
    258 #endif
    259