Set default GL state

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index b40198e87554e5fe84c5fc5c63779d68818cc142..1322fcfe0868d509eb91e5553933c1534627f27b 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -2265,6 +2265,45 @@ bool GLES2DecoderImpl::Initialize(
   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;
 }