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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 <ui/Rect.h>
     21 
     22 #include <utils/String8.h>
     23 #include <cutils/compiler.h>
     24 #include <gui/ISurfaceComposer.h>
     25 
     26 #include "GLES11RenderEngine.h"
     27 #include "Mesh.h"
     28 #include "Texture.h"
     29 
     30 // ---------------------------------------------------------------------------
     31 namespace android {
     32 // ---------------------------------------------------------------------------
     33 
     34 GLES11RenderEngine::GLES11RenderEngine() {
     35 
     36     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
     37     glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
     38 
     39     glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
     40     glPixelStorei(GL_PACK_ALIGNMENT, 4);
     41     glEnableClientState(GL_VERTEX_ARRAY);
     42     glShadeModel(GL_FLAT);
     43     glDisable(GL_DITHER);
     44     glDisable(GL_CULL_FACE);
     45 
     46     struct pack565 {
     47         inline uint16_t operator() (int r, int g, int b) const {
     48             return (r<<11)|(g<<5)|b;
     49         }
     50     } pack565;
     51 
     52     const uint16_t protTexData[] = { 0 };
     53     glGenTextures(1, &mProtectedTexName);
     54     glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
     55     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     56     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     57     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     58     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     59     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
     60             GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
     61 }
     62 
     63 GLES11RenderEngine::~GLES11RenderEngine() {
     64 }
     65 
     66 
     67 size_t GLES11RenderEngine::getMaxTextureSize() const {
     68     return mMaxTextureSize;
     69 }
     70 
     71 size_t GLES11RenderEngine::getMaxViewportDims() const {
     72     return
     73         mMaxViewportDims[0] < mMaxViewportDims[1] ?
     74             mMaxViewportDims[0] : mMaxViewportDims[1];
     75 }
     76 
     77 void GLES11RenderEngine::setViewportAndProjection(
     78         size_t vpw, size_t vph, Rect sourceCrop, size_t hwh, bool yswap,
     79         Transform::orientation_flags rotation) {
     80     glViewport(0, 0, vpw, vph);
     81     glMatrixMode(GL_PROJECTION);
     82     glLoadIdentity();
     83 
     84     size_t l = sourceCrop.left;
     85     size_t r = sourceCrop.right;
     86 
     87     // In GL, (0, 0) is the bottom-left corner, so flip y coordinates
     88     size_t t = hwh - sourceCrop.top;
     89     size_t b = hwh - sourceCrop.bottom;
     90 
     91     if (yswap) {
     92         glOrthof(l, r, t, b, 0, 1);
     93     } else {
     94         glOrthof(l, r, b, t, 0, 1);
     95     }
     96 
     97     switch (rotation) {
     98         case Transform::ROT_0:
     99             break;
    100         case Transform::ROT_90:
    101             glRotatef(90, 0, 0, 1);
    102             break;
    103         case Transform::ROT_180:
    104             glRotatef(180, 0, 0, 1);
    105             break;
    106         case Transform::ROT_270:
    107             glRotatef(270, 0, 0, 1);
    108             break;
    109         default:
    110             break;
    111     }
    112 
    113     glMatrixMode(GL_MODELVIEW);
    114 }
    115 
    116 void GLES11RenderEngine::setupLayerBlending(
    117     bool premultipliedAlpha, bool opaque, int alpha) {
    118     GLenum combineRGB;
    119     GLenum combineAlpha;
    120     GLenum src0Alpha;
    121     GLfloat envColor[4];
    122 
    123     if (CC_UNLIKELY(alpha < 0xFF)) {
    124         // Cv = premultiplied ? Cs*alpha : Cs
    125         // Av = !opaque       ? As*alpha : As
    126         combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
    127         combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
    128         src0Alpha    = GL_CONSTANT;
    129         envColor[0]  = alpha * (1.0f / 255.0f);
    130     } else {
    131         // Cv = Cs
    132         // Av = opaque ? 1.0 : As
    133         combineRGB   = GL_REPLACE;
    134         combineAlpha = GL_REPLACE;
    135         src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
    136         envColor[0]  = 1.0f;
    137     }
    138 
    139     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
    140     glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
    141     glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
    142     glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
    143     if (combineRGB == GL_MODULATE) {
    144         glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
    145         glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
    146     }
    147     glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
    148     glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
    149     glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
    150     if (combineAlpha == GL_MODULATE) {
    151         glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
    152         glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
    153     }
    154     if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
    155         envColor[1] = envColor[0];
    156         envColor[2] = envColor[0];
    157         envColor[3] = envColor[0];
    158         glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
    159     }
    160 
    161     if (alpha < 0xFF || !opaque) {
    162         glEnable(GL_BLEND);
    163         glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
    164                     GL_ONE_MINUS_SRC_ALPHA);
    165     } else {
    166         glDisable(GL_BLEND);
    167     }
    168 }
    169 
    170 void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
    171     glDisable(GL_TEXTURE_EXTERNAL_OES);
    172     glDisable(GL_TEXTURE_2D);
    173     if (alpha == 0xFF) {
    174         glDisable(GL_BLEND);
    175     } else {
    176         glEnable(GL_BLEND);
    177         glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
    178     }
    179     glColor4f(0, 0, 0, alpha/255.0f);
    180 }
    181 
    182 void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
    183     GLuint target = texture.getTextureTarget();
    184     glBindTexture(target, texture.getTextureName());
    185     GLenum filter = GL_NEAREST;
    186     if (texture.getFiltering()) {
    187         filter = GL_LINEAR;
    188     }
    189     glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    190     glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    191     glTexParameterx(target, GL_TEXTURE_MAG_FILTER, filter);
    192     glTexParameterx(target, GL_TEXTURE_MIN_FILTER, filter);
    193     glMatrixMode(GL_TEXTURE);
    194     glLoadMatrixf(texture.getMatrix().asArray());
    195     glMatrixMode(GL_MODELVIEW);
    196     glDisable(GL_TEXTURE_2D);
    197     glEnable(GL_TEXTURE_EXTERNAL_OES);
    198 }
    199 
    200 void GLES11RenderEngine::setupLayerBlackedOut() {
    201     glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
    202     glMatrixMode(GL_TEXTURE);
    203     glLoadIdentity();
    204     glMatrixMode(GL_MODELVIEW);
    205     glDisable(GL_TEXTURE_EXTERNAL_OES);
    206     glEnable(GL_TEXTURE_2D);
    207 }
    208 
    209 void GLES11RenderEngine::disableTexturing() {
    210     glDisable(GL_TEXTURE_EXTERNAL_OES);
    211     glDisable(GL_TEXTURE_2D);
    212 }
    213 
    214 void GLES11RenderEngine::disableBlending() {
    215     glDisable(GL_BLEND);
    216 }
    217 
    218 void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
    219         uint32_t* texName, uint32_t* fbName, uint32_t* status) {
    220     GLuint tname, name;
    221     // turn our EGLImage into a texture
    222     glGenTextures(1, &tname);
    223     glBindTexture(GL_TEXTURE_2D, tname);
    224     glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
    225 
    226     // create a Framebuffer Object to render into
    227     glGenFramebuffersOES(1, &name);
    228     glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
    229     glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
    230             GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
    231 
    232     *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
    233     *texName = tname;
    234     *fbName = name;
    235 }
    236 
    237 void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
    238     glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
    239     glDeleteFramebuffersOES(1, &fbName);
    240     glDeleteTextures(1, &texName);
    241 }
    242 
    243 void GLES11RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
    244     glColor4f(r, g, b, a);
    245     glDisable(GL_TEXTURE_EXTERNAL_OES);
    246     glDisable(GL_TEXTURE_2D);
    247     glDisable(GL_BLEND);
    248 }
    249 
    250 void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
    251     if (mesh.getTexCoordsSize()) {
    252         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    253         glTexCoordPointer(mesh.getTexCoordsSize(),
    254                 GL_FLOAT,
    255                 mesh.getByteStride(),
    256                 mesh.getTexCoords());
    257     }
    258 
    259     glVertexPointer(mesh.getVertexSize(),
    260             GL_FLOAT,
    261             mesh.getByteStride(),
    262             mesh.getPositions());
    263 
    264     glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
    265 
    266     if (mesh.getTexCoordsSize()) {
    267         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    268     }
    269 }
    270 
    271 void GLES11RenderEngine::beginGroup(const mat4& /*colorTransform*/) {
    272     // doesn't do anything in GLES 1.1
    273 }
    274 
    275 void GLES11RenderEngine::endGroup() {
    276     // doesn't do anything in GLES 1.1
    277 }
    278 
    279 void GLES11RenderEngine::dump(String8& result) {
    280     RenderEngine::dump(result);
    281 }
    282 
    283 // ---------------------------------------------------------------------------
    284 }; // namespace android
    285 // ---------------------------------------------------------------------------
    286 
    287 #if defined(__gl2_h_)
    288 #error "don't include gl2/gl2.h in this file"
    289 #endif
    290