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      1 /*
      2 * Copyright 2011 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 "GL2Decoder.h"
     18 #include <EGL/egl.h>
     19 #include <GLES2/gl2.h>
     20 #include <GLES2/gl2ext.h>
     21 
     22 
     23 GL2Decoder::GL2Decoder()
     24 {
     25     m_contextData = NULL;
     26     m_GL2library = NULL;
     27 }
     28 
     29 GL2Decoder::~GL2Decoder()
     30 {
     31     delete m_GL2library;
     32 }
     33 
     34 void *GL2Decoder::s_getProc(const char *name, void *userData)
     35 {
     36     GL2Decoder *ctx = (GL2Decoder *) userData;
     37 
     38     if (ctx == NULL || ctx->m_GL2library == NULL) {
     39         return NULL;
     40     }
     41 
     42     void *func = NULL;
     43 #ifdef USE_EGL_GETPROCADDRESS
     44     func = (void *) eglGetProcAddress(name);
     45 #endif
     46     if (func == NULL) {
     47         func = (void *) ctx->m_GL2library->findSymbol(name);
     48     }
     49     return func;
     50 }
     51 
     52 int GL2Decoder::initGL(get_proc_func_t getProcFunc, void *getProcFuncData)
     53 {
     54     if (getProcFunc == NULL) {
     55         const char *libname = GLES2_LIBNAME;
     56         if (getenv(GLES2_LIBNAME_VAR) != NULL) {
     57             libname = getenv(GLES2_LIBNAME_VAR);
     58         }
     59 
     60         m_GL2library = osUtils::dynLibrary::open(libname);
     61         if (m_GL2library == NULL) {
     62             fprintf(stderr, "%s: Couldn't find %s \n", __FUNCTION__, libname);
     63             return -1;
     64         }
     65         this->initDispatchByName(s_getProc, this);
     66     } else {
     67         this->initDispatchByName(getProcFunc, getProcFuncData);
     68     }
     69 
     70     set_glGetCompressedTextureFormats(s_glGetCompressedTextureFormats);
     71     set_glVertexAttribPointerData(s_glVertexAttribPointerData);
     72     set_glVertexAttribPointerOffset(s_glVertexAttribPointerOffset);
     73 
     74     set_glDrawElementsOffset(s_glDrawElementsOffset);
     75     set_glDrawElementsData(s_glDrawElementsData);
     76     set_glShaderString(s_glShaderString);
     77     set_glFinishRoundTrip(s_glFinishRoundTrip);
     78     return 0;
     79 
     80 }
     81 
     82 int GL2Decoder::s_glFinishRoundTrip(void *self)
     83 {
     84     GL2Decoder *ctx = (GL2Decoder *)self;
     85     ctx->glFinish();
     86     return 0;
     87 }
     88 
     89 void GL2Decoder::s_glGetCompressedTextureFormats(void *self, int count, GLint *formats)
     90 {
     91     GL2Decoder *ctx = (GL2Decoder *) self;
     92 
     93     int nFormats;
     94     ctx->glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS, &nFormats);
     95     if (nFormats > count) {
     96         fprintf(stderr, "%s: GetCompressedTextureFormats: The requested number of formats does not match the number that is reported by OpenGL\n", __FUNCTION__);
     97     } else {
     98         ctx->glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS, formats);
     99     }
    100 }
    101 
    102 void GL2Decoder::s_glVertexAttribPointerData(void *self, GLuint indx, GLint size, GLenum type,
    103                                              GLboolean normalized, GLsizei stride,  void * data, GLuint datalen)
    104 {
    105     GL2Decoder *ctx = (GL2Decoder *) self;
    106     if (ctx->m_contextData != NULL) {
    107         ctx->m_contextData->storePointerData(indx, data, datalen);
    108         // note - the stride of the data is always zero when it comes out of the codec.
    109         // See gl2.attrib for the packing function call.
    110         ctx->glVertexAttribPointer(indx, size, type, normalized, 0, ctx->m_contextData->pointerData(indx));
    111     }
    112 }
    113 
    114 void GL2Decoder::s_glVertexAttribPointerOffset(void *self, GLuint indx, GLint size, GLenum type,
    115                                                GLboolean normalized, GLsizei stride,  GLuint data)
    116 {
    117     GL2Decoder *ctx = (GL2Decoder *) self;
    118     ctx->glVertexAttribPointer(indx, size, type, normalized, stride, (GLvoid *)data);
    119 }
    120 
    121 
    122 void GL2Decoder::s_glDrawElementsData(void *self, GLenum mode, GLsizei count, GLenum type, void * data, GLuint datalen)
    123 {
    124     GL2Decoder *ctx = (GL2Decoder *)self;
    125     ctx->glDrawElements(mode, count, type, data);
    126 }
    127 
    128 
    129 void GL2Decoder::s_glDrawElementsOffset(void *self, GLenum mode, GLsizei count, GLenum type, GLuint offset)
    130 {
    131     GL2Decoder *ctx = (GL2Decoder *)self;
    132     ctx->glDrawElements(mode, count, type, (void *)offset);
    133 }
    134 
    135 void GL2Decoder::s_glShaderString(void *self, GLuint shader, const GLchar* string, GLsizei len)
    136 {
    137     GL2Decoder *ctx = (GL2Decoder *)self;
    138     ctx->glShaderSource(shader, 1, &string, NULL);
    139 }
    140