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      1 /*
      2  * Copyright (C) 2016 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 <debug/NullGlesDriver.h>
     18 
     19 namespace android {
     20 namespace uirenderer {
     21 namespace debug {
     22 
     23 sk_sp<const GrGLInterface> NullGlesDriver::getSkiaInterface() {
     24     sk_sp<const GrGLInterface> skiaInterface(GrGLCreateNullInterface());
     25     return skiaInterface;
     26 }
     27 
     28 struct {
     29     GLboolean scissorEnabled;
     30 } gState;
     31 
     32 static void nullglGenCommon(GLsizei n, GLuint *buffers) {
     33     static GLuint nextId = 0;
     34     int i;
     35     for(i = 0; i < n; i++) {
     36         buffers[i] = ++nextId;
     37     }
     38 }
     39 
     40 void NullGlesDriver::glGenBuffers_(GLsizei n, GLuint *buffers) {
     41     nullglGenCommon(n, buffers);
     42 }
     43 
     44 void NullGlesDriver::glGenFramebuffers_(GLsizei n, GLuint *framebuffers) {
     45     nullglGenCommon(n, framebuffers);
     46 }
     47 
     48 void NullGlesDriver::glGenRenderbuffers_(GLsizei n, GLuint *renderbuffers) {
     49     nullglGenCommon(n, renderbuffers);
     50 }
     51 
     52 void NullGlesDriver::glGenTextures_(GLsizei n, GLuint *textures) {
     53     nullglGenCommon(n, textures);
     54 }
     55 
     56 GLuint NullGlesDriver::glCreateProgram_(void) {
     57     static GLuint nextProgram = 0;
     58     return ++nextProgram;
     59 }
     60 
     61 GLuint NullGlesDriver::glCreateShader_(GLenum type) {
     62     static GLuint nextShader = 0;
     63     return ++nextShader;
     64 }
     65 
     66 void NullGlesDriver::glGetProgramiv_(GLuint program, GLenum pname, GLint *params) {
     67     switch (pname) {
     68     case GL_DELETE_STATUS:
     69     case GL_LINK_STATUS:
     70     case GL_VALIDATE_STATUS:
     71         *params = GL_TRUE;
     72         break;
     73     case GL_INFO_LOG_LENGTH:
     74         *params = 16;
     75         break;
     76     }
     77 }
     78 
     79 void NullGlesDriver::glGetProgramInfoLog_(GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog) {
     80     *length = snprintf(infoLog, bufSize, "success");
     81     if (*length >= bufSize) {
     82         *length = bufSize - 1;
     83     }
     84 }
     85 
     86 void NullGlesDriver::glGetShaderiv_(GLuint shader, GLenum pname, GLint *params) {
     87     switch (pname) {
     88     case GL_COMPILE_STATUS:
     89     case GL_DELETE_STATUS:
     90         *params = GL_TRUE;
     91     }
     92 }
     93 
     94 void NullGlesDriver::glGetShaderInfoLog_(GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog) {
     95     *length = snprintf(infoLog, bufSize, "success");
     96     if (*length >= bufSize) {
     97         *length = bufSize - 1;
     98     }
     99 }
    100 
    101 void setBooleanState(GLenum cap, GLboolean value) {
    102     switch (cap) {
    103     case GL_SCISSOR_TEST:
    104         gState.scissorEnabled = value;
    105         break;
    106     }
    107 }
    108 
    109 void NullGlesDriver::glEnable_(GLenum cap) {
    110     setBooleanState(cap, GL_TRUE);
    111 }
    112 
    113 void NullGlesDriver::glDisable_(GLenum cap) {
    114     setBooleanState(cap, GL_FALSE);
    115 }
    116 
    117 GLboolean NullGlesDriver::glIsEnabled_(GLenum cap) {
    118     switch (cap) {
    119     case GL_SCISSOR_TEST:
    120         return gState.scissorEnabled;
    121     default:
    122         return GL_FALSE;
    123     }
    124 }
    125 
    126 void NullGlesDriver::glGetIntegerv_(GLenum pname, GLint *data) {
    127     switch (pname) {
    128     case GL_MAX_TEXTURE_SIZE:
    129         *data = 2048;
    130         break;
    131     case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
    132         *data = 4;
    133         break;
    134     default:
    135         *data = 0;
    136     }
    137 }
    138 
    139 GLenum NullGlesDriver::glCheckFramebufferStatus_(GLenum target) {
    140     switch (target) {
    141     case GL_FRAMEBUFFER:
    142         return GL_FRAMEBUFFER_COMPLETE;
    143     default:
    144         return 0; // error case
    145     }
    146 }
    147 
    148 static const char* getString(GLenum name) {
    149     switch (name) {
    150     case GL_VENDOR:
    151         return "android";
    152     case GL_RENDERER:
    153         return "null";
    154     case GL_VERSION:
    155         return "OpenGL ES 2.0 rev1";
    156     case GL_SHADING_LANGUAGE_VERSION:
    157         return "OpenGL ES GLSL ES 2.0 rev1";
    158     case GL_EXTENSIONS:
    159     default:
    160         return "";
    161     }
    162 }
    163 
    164 const GLubyte* NullGlesDriver::glGetString_(GLenum name) {
    165     return (GLubyte*) getString(name);
    166 }
    167 
    168 } // namespace debug
    169 } // namespace uirenderer
    170 } // namespace android
    171