Add GL_EXT_multisampled_render_to_texture support to command buffer.

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 1229 matching lines @@
   // Wrapper for glFramebufferRenderbufffer.
   void DoFramebufferRenderbuffer(
       GLenum target, GLenum attachment, GLenum renderbuffertarget,
       GLuint renderbuffer);
 
   // Wrapper for glFramebufferTexture2D.
   void DoFramebufferTexture2D(
       GLenum target, GLenum attachment, GLenum textarget, GLuint texture,
       GLint level);
 
+  // Wrapper for glFramebufferTexture2DMultisampleEXT.
+  void DoFramebufferTexture2DMultisample(
+      GLenum target, GLenum attachment, GLenum textarget,
+      GLuint texture, GLint level, GLsizei samples);
+
+  // Common implementation for both DoFramebufferTexture2D wrappers.
+  void DoFramebufferTexture2DCommon(const char* name,
+      GLenum target, GLenum attachment, GLenum textarget,
+      GLuint texture, GLint level, GLsizei samples);
+
   // Wrapper for glGenerateMipmap
   void DoGenerateMipmap(GLenum target);
 
   // Helper for GenSharedIdsCHROMIUM commands.
   void DoGenSharedIdsCHROMIUM(
       GLuint namespace_id, GLuint id_offset, GLsizei n, GLuint* ids);
 
+  // Helper for DoGetBooleanv, Floatv, and Intergerv to adjust pname
+  // to account for different pname values defined in different extension
+  // variants.
+  GLenum AdjustGetPname(GLenum pname);
+
   // Wrapper for DoGetBooleanv.
   void DoGetBooleanv(GLenum pname, GLboolean* params);
 
   // Wrapper for DoGetFloatv.
   void DoGetFloatv(GLenum pname, GLfloat* params);
 
   // Wrapper for glGetFramebufferAttachmentParameteriv.
   void DoGetFramebufferAttachmentParameteriv(
       GLenum target, GLenum attachment, GLenum pname, GLint* params);
 
@@ skipping 3073 matching lines @@
 }
 
 bool GLES2DecoderImpl::GetNumValuesReturnedForGLGet(
     GLenum pname, GLsizei* num_values) {
   if (state_.GetStateAsGLint(pname, NULL, num_values)) {
     return true;
   }
   return GetHelper(pname, NULL, num_values);
 }
 
+GLenum GLES2DecoderImpl::AdjustGetPname(GLenum pname) {
+  if (GL_MAX_SAMPLES == pname &&
+      features().use_img_for_multisampled_render_to_texture) {
+    return GL_MAX_SAMPLES_IMG;
+  }
+  return pname;
+}
+
 void GLES2DecoderImpl::DoGetBooleanv(GLenum pname, GLboolean* params) {
   DCHECK(params);
   GLsizei num_written = 0;
   if (GetNumValuesReturnedForGLGet(pname, &num_written)) {
     scoped_ptr<GLint[]> values(new GLint[num_written]);
     if (!state_.GetStateAsGLint(pname, values.get(), &num_written)) {
       GetHelper(pname, values.get(), &num_written);
     }
     for (GLsizei ii = 0; ii < num_written; ++ii) {
       params[ii] = static_cast<GLboolean>(values[ii]);
     }
   } else {
+    pname = AdjustGetPname(pname);
     glGetBooleanv(pname, params);
   }
 }
 
 void GLES2DecoderImpl::DoGetFloatv(GLenum pname, GLfloat* params) {
   DCHECK(params);
   GLsizei num_written = 0;
   if (!state_.GetStateAsGLfloat(pname, params, &num_written)) {
     if (GetHelper(pname, NULL, &num_written)) {
       scoped_ptr<GLint[]> values(new GLint[num_written]);
       GetHelper(pname, values.get(), &num_written);
       for (GLsizei ii = 0; ii < num_written; ++ii) {
         params[ii] = static_cast<GLfloat>(values[ii]);
       }
     } else {
+      pname = AdjustGetPname(pname);
       glGetFloatv(pname, params);
     }
   }
 }
 
 void GLES2DecoderImpl::DoGetIntegerv(GLenum pname, GLint* params) {
   DCHECK(params);
   GLsizei num_written;
   if (!state_.GetStateAsGLint(pname, params, &num_written) &&
       !GetHelper(pname, params, &num_written)) {
+    pname = AdjustGetPname(pname);
     glGetIntegerv(pname, params);
   }
 }
 
 void GLES2DecoderImpl::DoGetProgramiv(
     GLuint program_id, GLenum pname, GLint* params) {
   Program* program = GetProgramInfoNotShader(program_id, "glGetProgramiv");
   if (!program) {
     return;
   }
@@ skipping 455 matching lines @@
   GLenum completeness = framebuffer->IsPossiblyComplete();
   if (completeness != GL_FRAMEBUFFER_COMPLETE) {
     return completeness;
   }
   return framebuffer->GetStatus(texture_manager(), target);
 }
 
 void GLES2DecoderImpl::DoFramebufferTexture2D(
     GLenum target, GLenum attachment, GLenum textarget,
     GLuint client_texture_id, GLint level) {
+  DoFramebufferTexture2DCommon(
+    "glFramebufferTexture2D", target, attachment,
+    textarget, client_texture_id, level, 0);
+}
+
+void GLES2DecoderImpl::DoFramebufferTexture2DMultisample(
+    GLenum target, GLenum attachment, GLenum textarget,
+    GLuint client_texture_id, GLint level, GLsizei samples) {
+  if (!features().multisampled_render_to_texture) {
+    LOCAL_SET_GL_ERROR(
+        GL_INVALID_OPERATION,
+        "glFramebufferTexture2DMultisample", "function not available");
+    return;
+  }
+  DoFramebufferTexture2DCommon(
+    "glFramebufferTexture2DMultisample", target, attachment,
+    textarget, client_texture_id, level, samples);
+}
+
+void GLES2DecoderImpl::DoFramebufferTexture2DCommon(
+    const char* name, GLenum target, GLenum attachment, GLenum textarget,
+    GLuint client_texture_id, GLint level, GLsizei samples) {
+  if (samples > renderbuffer_manager()->max_samples()) {
+    LOCAL_SET_GL_ERROR(
+        GL_INVALID_VALUE,
+        "glFramebufferTexture2DMultisample", "samples too large");
+    return;
+  }
   Framebuffer* framebuffer = GetFramebufferInfoForTarget(target);
   if (!framebuffer) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION,
-        "glFramebufferTexture2D", "no framebuffer bound.");
+        name, "no framebuffer bound.");
     return;
   }
   GLuint service_id = 0;
   TextureRef* texture_ref = NULL;
   if (client_texture_id) {
     texture_ref = GetTexture(client_texture_id);
     if (!texture_ref) {
       LOCAL_SET_GL_ERROR(
           GL_INVALID_OPERATION,
-          "glFramebufferTexture2D", "unknown texture_ref");
+          name, "unknown texture_ref");
       return;
     }
     service_id = texture_ref->service_id();
   }
 
   if (!texture_manager()->ValidForTarget(textarget, level, 0, 0, 1)) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_VALUE,
-        "glFramebufferTexture2D", "level out of range");
+        name, "level out of range");
     return;
   }
 
-  LOCAL_COPY_REAL_GL_ERRORS_TO_WRAPPER("glFramebufferTexture2D");
-  glFramebufferTexture2DEXT(target, attachment, textarget, service_id, level);
-  GLenum error = LOCAL_PEEK_GL_ERROR("glFramebufferTexture2D");
+  LOCAL_COPY_REAL_GL_ERRORS_TO_WRAPPER(name);
+  if (0 == samples) {
+    glFramebufferTexture2DEXT(target, attachment, textarget, service_id, level);
+  } else {
+    if (features().use_img_for_multisampled_render_to_texture) {

[apatrick_chromium, 2013/07/08 21:28:03]

Does it need something like this? I can't find anything in the spec about the
texture being copied into the implicit multisample buffer.

framebuffer->MarkAttachmentAsCleared(renderbuffer_manager(),
                                     texture_manager(),
                                     attachment,
                                     false);

+      glFramebufferTexture2DMultisampleIMG(target, attachment, textarget,
+          service_id, level, samples);
+    } else {
+      glFramebufferTexture2DMultisampleEXT(target, attachment, textarget,
+          service_id, level, samples);
+    }
+  }
+  GLenum error = LOCAL_PEEK_GL_ERROR(name);
   if (error == GL_NO_ERROR) {
-    framebuffer->AttachTexture(attachment, texture_ref, textarget, level);
+    framebuffer->AttachTexture(attachment, texture_ref, textarget, level,
+         samples);
   }
   if (framebuffer == state_.bound_draw_framebuffer.get()) {
     clear_state_dirty_ = true;
   }
   OnFboChanged();
 }
 
 void GLES2DecoderImpl::DoGetFramebufferAttachmentParameteriv(
     GLenum target, GLenum attachment, GLenum pname, GLint* params) {
   Framebuffer* framebuffer = GetFramebufferInfoForTarget(target);
   if (!framebuffer) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION,
         "glFramebufferAttachmentParameteriv", "no framebuffer bound");
     return;
   }
   if (pname == GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME) {
     const Framebuffer::Attachment* attachment_object =
         framebuffer->GetAttachment(attachment);
     *params = attachment_object ? attachment_object->object_name() : 0;
   } else {
+    if (pname == GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT &&
+        features().use_img_for_multisampled_render_to_texture) {
+      pname = GL_TEXTURE_SAMPLES_IMG;
+    }
     glGetFramebufferAttachmentParameterivEXT(target, attachment, pname, params);
   }
 }
 
 void GLES2DecoderImpl::DoGetRenderbufferParameteriv(
     GLenum target, GLenum pname, GLint* params) {
   Renderbuffer* renderbuffer =
       GetRenderbufferInfoForTarget(GL_RENDERBUFFER);
   if (!renderbuffer) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION,
         "glGetRenderbufferParameteriv", "no renderbuffer bound");
     return;
   }
   switch (pname) {
     case GL_RENDERBUFFER_INTERNAL_FORMAT:
       *params = renderbuffer->internal_format();
       break;
     case GL_RENDERBUFFER_WIDTH:
       *params = renderbuffer->width();
       break;
     case GL_RENDERBUFFER_HEIGHT:
       *params = renderbuffer->height();
       break;
+    case GL_RENDERBUFFER_SAMPLES_EXT:
+      if (features().use_img_for_multisampled_render_to_texture) {
+        glGetRenderbufferParameterivEXT(target, GL_RENDERBUFFER_SAMPLES_IMG,
+            params);
+      } else {
+        glGetRenderbufferParameterivEXT(target, GL_RENDERBUFFER_SAMPLES_EXT,
+            params);
+      }
     default:
       glGetRenderbufferParameterivEXT(target, pname, params);
       break;
   }
 }
 
 void GLES2DecoderImpl::DoBlitFramebufferEXT(
     GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
     GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
     GLbitfield mask, GLenum filter) {
@@ skipping 15 matching lines @@
   } else {
     glBlitFramebufferEXT(
         srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, filter);
   }
   EnableDisable(GL_SCISSOR_TEST, state_.enable_flags.scissor_test);
 }
 
 void GLES2DecoderImpl::DoRenderbufferStorageMultisample(
     GLenum target, GLsizei samples, GLenum internalformat,
     GLsizei width, GLsizei height) {
-  if (!features().chromium_framebuffer_multisample) {
+  if (!features().chromium_framebuffer_multisample &&
+      !features().multisampled_render_to_texture) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION,
         "glRenderbufferStorageMultisample", "function not available");
     return;
   }
 
   Renderbuffer* renderbuffer =
       GetRenderbufferInfoForTarget(GL_RENDERBUFFER);
   if (!renderbuffer) {
     LOCAL_SET_GL_ERROR(
@@ skipping 32 matching lines @@
         "glRenderbufferStorageMultsample", "out of memory");
     return;
   }
 
   GLenum impl_format = RenderbufferManager::
       InternalRenderbufferFormatToImplFormat(internalformat);
   LOCAL_COPY_REAL_GL_ERRORS_TO_WRAPPER("glRenderbufferStorageMultisample");
   if (IsAngle()) {
     glRenderbufferStorageMultisampleANGLE(
         target, samples, impl_format, width, height);
+  } else if (features().use_img_for_multisampled_render_to_texture) {
+    glRenderbufferStorageMultisampleIMG(
+        target, samples, impl_format, width, height);
   } else {
     glRenderbufferStorageMultisampleEXT(
         target, samples, impl_format, width, height);
   }
   GLenum error = LOCAL_PEEK_GL_ERROR("glRenderbufferStorageMultisample");
   if (error == GL_NO_ERROR) {
     // TODO(gman): If renderbuffers tracked which framebuffers they were
     // attached to we could just mark those framebuffers as not complete.
     framebuffer_manager()->IncFramebufferStateChangeCount();
     renderbuffer_manager()->SetInfo(
@@ skipping 5412 matching lines @@
   return error::kNoError;
 }
 
 // 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