Fix for gl programs. An unsuccessful link should report

the link is unsuccessful but not replace the old program.

TEST=webgl conformance tests pass
BUG=none

Review URL: http://codereview.chromium.org/6242006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71882 0039d316-1c4b-4281-b951-d872f2087c98

gpu/command_buffer/service/gles2_cmd_decoder.cc

@@ -3607,16 +3607,17 @@ void GLES2DecoderImpl::DoLinkProgram(GLuint program) {
   if (!info) {
     return;
   }
+
+  info->ClearLinkStatus();
   if (!info->CanLink()) {
     return;
   }
+
   glLinkProgram(info->service_id());
   GLint success = 0;
   glGetProgramiv(info->service_id(), GL_LINK_STATUS, &success);
   if (success) {
     info->Update();
-  } else {
-    info->Reset();
   }
 };
 

gpu/command_buffer/service/program_manager.cc

@@ -48,11 +48,13 @@ ProgramManager::ProgramInfo::ProgramInfo(GLuint service_id)
       max_attrib_name_length_(0),
       max_uniform_name_length_(0),
       service_id_(service_id),
-      valid_(false) {
+      valid_(false),
+      link_status_(false) {
 }
 
 void ProgramManager::ProgramInfo::Reset() {
   valid_ = false;
+  link_status_ = false;
   max_uniform_name_length_ = 0;
   max_attrib_name_length_ = 0;
   attrib_infos_.clear();
@@ -76,6 +78,7 @@ void ProgramManager::ProgramInfo::UpdateLogInfo() {
 
 void ProgramManager::ProgramInfo::Update() {
   Reset();
+  link_status_ = true;
   GLint num_attribs = 0;
   GLint max_len = 0;
   GLint max_location = -1;
@@ -337,7 +340,7 @@ void ProgramManager::ProgramInfo::GetProgramiv(GLenum pname, GLint* params) {
       *params = max_uniform_name_length_ + 1;
       break;
     case GL_LINK_STATUS:
-      *params = valid_;
+      *params = link_status_;
       break;
     case GL_INFO_LOG_LENGTH:
       // Notice +1 to accomodate NULL terminator.

gpu/command_buffer/service/program_manager.h

@@ -75,9 +75,6 @@ class ProgramManager {
       return sampler_indices_;
     }
 
-    // Resets the program after an unsuccessful link.
-    void Reset();
-
     // Updates the program info after a successful link.
     void Update();
 
@@ -131,6 +128,10 @@ class ProgramManager {
       return valid_;
     }
 
+    void ClearLinkStatus() {
+      link_status_ = false;
+    }
+
     bool AttachShader(ShaderManager* manager, ShaderManager::ShaderInfo* info);
     void DetachShader(ShaderManager* manager, ShaderManager::ShaderInfo* info);
 
@@ -169,6 +170,9 @@ class ProgramManager {
       service_id_ = 0;
     }
 
+    // Resets the program.
+    void Reset();
+
     const UniformInfo* AddUniformInfo(
         GLsizei size, GLenum type, GLint location, const std::string& name);
 
@@ -205,9 +209,12 @@ class ProgramManager {
     // Shaders by type of shader.
     ShaderManager::ShaderInfo::Ref attached_shaders_[kMaxAttachedShaders];
 
-    // This is true if glLinkProgram was successful.
+    // This is true if glLinkProgram was successful at least once.
     bool valid_;
 
+    // This is true if glLinkProgram was successful last time it was called.
+    bool link_status_;
+
     // Log info
     std::string log_info_;
   };