Set default GL state

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 2247 matching lines @@
 
   viewport_width_ = size.width();
   viewport_height_ = size.height();
   glViewport(viewport_x_, viewport_y_, viewport_width_, viewport_height_);
 
   GLint viewport_params[4] = { 0 };
   glGetIntegerv(GL_MAX_VIEWPORT_DIMS, viewport_params);
   viewport_max_width_ = viewport_params[0];
   viewport_max_height_ = viewport_params[1];
 
+  // Set all the default state because some GL drivers get it wrong.
+  glActiveTexture(GL_TEXTURE0 + active_texture_unit_);
+  glLineWidth(1.0);
+  EnableDisable(GL_BLEND, enable_blend_);
+  glBlendColor(0.0f, 0.0, 0.0f, 0.0f);
+  glBlendFunc(GL_ONE, GL_ZERO);
+  glBlendEquation(GL_FUNC_ADD);
+  glBlendFuncSeparate(GL_ONE, GL_ZERO, GL_ONE, GL_ZERO);
+  glClearColor(clear_red_, clear_green_, clear_blue_, clear_alpha_);
+  glColorMask(mask_red_, mask_green_, mask_blue_, mask_alpha_);
+  EnableDisable(GL_CULL_FACE, enable_cull_face_);
+  glCullFace(GL_BACK);
+  glClearDepth(clear_depth_);
+  glDepthFunc(GL_LESS);
+  glDepthRange(0.0f, 1.0f);
+  EnableDisable(GL_DEPTH_TEST, enable_depth_test_);
+  glEnable(GL_DITHER);
+  glFrontFace(GL_CCW);
+  glHint(GL_GENERATE_MIPMAP_HINT, GL_DONT_CARE);
+  glLineWidth(1.0f);
+  glPixelStorei(GL_PACK_ALIGNMENT, pack_alignment_);
+  glPolygonOffset(0.0f, 0.0f);
+  glDisable(GL_POLYGON_OFFSET_FILL);
+  glSampleCoverage(1.0, false);
+  glScissor(viewport_x_, viewport_y_, viewport_width_, viewport_height_);
+  EnableDisable(GL_SCISSOR_TEST, enable_scissor_test_);
+  EnableDisable(GL_STENCIL_TEST, enable_stencil_test_);
+  glClearStencil(clear_stencil_);
+  glStencilFunc(GL_ALWAYS, 0, 0xFFFFFFFFU);
+  glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+  glStencilMaskSeparate(GL_FRONT, mask_stencil_front_);
+  glStencilMaskSeparate(GL_BACK, mask_stencil_back_);
+  glPixelStorei(GL_UNPACK_ALIGNMENT, unpack_alignment_);
+
+  DoBindBuffer(GL_ARRAY_BUFFER, 0);
+  DoBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+  DoBindFramebuffer(GL_FRAMEBUFFER, 0);
+  DoBindRenderbuffer(GL_RENDERBUFFER, 0);
+
   return true;
 }
 
 void GLES2DecoderImpl::UpdateCapabilities() {
   util_.set_num_compressed_texture_formats(
       validators_->compressed_texture_format.GetValues().size());
   util_.set_num_shader_binary_formats(
       validators_->shader_binary_format.GetValues().size());
 }
 
@@ skipping 6758 matching lines @@
   BindAndApplyTextureParameters(info);
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu