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gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.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_copy_texture_chromium.h"
 
 #include "base/basictypes.h"
 #include "gpu/command_buffer/common/types.h"
 #include "gpu/command_buffer/service/gl_utils.h"
+#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #define SHADER0(Src) \
     "#ifdef GL_ES\n"\
     "precision mediump float;\n"\
     "#endif\n"\
     #Src
 #define SHADER(Src) SHADER0(Src)
 
 namespace {
 
 const GLfloat kQuadVertices[] = { -1.0f, -1.0f, 0.0f, 1.0f,
                                    1.0f, -1.0f, 0.0f, 1.0f,
                                    1.0f,  1.0f, 0.0f, 1.0f,
                                   -1.0f,  1.0f, 0.0f, 1.0f };
 
 const GLfloat kTextureCoords[] = { 0.0f, 0.0f,
                                    1.0f, 0.0f,
                                    1.0f, 1.0f,
                                    0.0f, 1.0f };
 
-const int kNumShaders = 7;
+const int kNumShaders = 13;
 enum ShaderId {
   VERTEX_SHADER_POS_TEX,
   FRAGMENT_SHADER_TEX,
   FRAGMENT_SHADER_TEX_FLIP_Y,
   FRAGMENT_SHADER_TEX_PREMULTIPLY_ALPHA,
   FRAGMENT_SHADER_TEX_UNPREMULTIPLY_ALPHA,
   FRAGMENT_SHADER_TEX_PREMULTIPLY_ALPHA_FLIP_Y,
-  FRAGMENT_SHADER_TEX_UNPREMULTIPLY_ALPHA_FLIP_Y
+  FRAGMENT_SHADER_TEX_UNPREMULTIPLY_ALPHA_FLIP_Y,
+  FRAGMENT_SHADER_TEX_OES,
+  FRAGMENT_SHADER_TEX_OES_FLIP_Y,
+  FRAGMENT_SHADER_TEX_OES_PREMULTIPLY_ALPHA,
+  FRAGMENT_SHADER_TEX_OES_UNPREMULTIPLY_ALPHA,
+  FRAGMENT_SHADER_TEX_OES_PREMULTIPLY_ALPHA_FLIP_Y,
+  FRAGMENT_SHADER_TEX_OES_UNPREMULTIPLY_ALPHA_FLIP_Y
 };
 
 enum ProgramId {
   PROGRAM_COPY_TEXTURE,
   PROGRAM_COPY_TEXTURE_FLIP_Y,
   PROGRAM_COPY_TEXTURE_PREMULTIPLY_ALPHA,
   PROGRAM_COPY_TEXTURE_UNPREMULTIPLY_ALPHA,
   PROGRAM_COPY_TEXTURE_PREMULTIPLY_ALPHA_FLIPY,
-  PROGRAM_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_FLIPY
+  PROGRAM_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_FLIPY,
+  PROGRAM_COPY_TEXTURE_OES,
+  PROGRAM_COPY_TEXTURE_OES_FLIP_Y,
+  PROGRAM_COPY_TEXTURE_OES_PREMULTIPLY_ALPHA,
+  PROGRAM_COPY_TEXTURE_OES_UNPREMULTIPLY_ALPHA,
+  PROGRAM_COPY_TEXTURE_OES_PREMULTIPLY_ALPHA_FLIPY,
+  PROGRAM_COPY_TEXTURE_OES_UNPREMULTIPLY_ALPHA_FLIPY
 };
 
 // Returns the correct program to evaluate the copy operation for
 // the CHROMIUM_flipy and premultiply alpha pixel store settings.
 ProgramId GetProgram(bool flip_y, bool premultiply_alpha,
-                     bool unpremultiply_alpha) {
+                     bool unpremultiply_alpha, bool is_source_external_oes) {
   // If both pre-multiply and unpremultiply are requested, then perform no
   // alpha manipulation.
   if (premultiply_alpha && unpremultiply_alpha) {
     premultiply_alpha = false;
     unpremultiply_alpha = false;
   }
 
+  if (is_source_external_oes) {
+    if (flip_y && premultiply_alpha)
+      return PROGRAM_COPY_TEXTURE_OES_PREMULTIPLY_ALPHA_FLIPY;
+
+    if (flip_y && unpremultiply_alpha)
+      return PROGRAM_COPY_TEXTURE_OES_UNPREMULTIPLY_ALPHA_FLIPY;
+
+    if (flip_y)
+      return PROGRAM_COPY_TEXTURE_OES_FLIP_Y;
+
+    if (premultiply_alpha)
+      return PROGRAM_COPY_TEXTURE_OES_PREMULTIPLY_ALPHA;
+
+    if (unpremultiply_alpha)
+      return PROGRAM_COPY_TEXTURE_OES_UNPREMULTIPLY_ALPHA;
+
+    return PROGRAM_COPY_TEXTURE_OES;
+  }
+
   if (flip_y && premultiply_alpha)
     return PROGRAM_COPY_TEXTURE_PREMULTIPLY_ALPHA_FLIPY;
 
   if (flip_y && unpremultiply_alpha)
     return PROGRAM_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_FLIPY;
 
   if (flip_y)
     return PROGRAM_COPY_TEXTURE_FLIP_Y;
 
   if (premultiply_alpha)
@@ skipping 57 matching lines @@
         });
     case FRAGMENT_SHADER_TEX_UNPREMULTIPLY_ALPHA_FLIP_Y:
       return SHADER(
         uniform sampler2D u_texSampler;
         varying vec2 v_uv;
         void main(void) {
           gl_FragColor = texture2D(u_texSampler, vec2(v_uv.s, 1.0 - v_uv.t));
           if (gl_FragColor.a > 0.0)
             gl_FragColor.rgb /= gl_FragColor.a;
         });
+    case FRAGMENT_SHADER_TEX_OES:
+      // Cannot use the SHADER() macro because of the '#' char
+      return
+          "#extension GL_OES_EGL_image_external : require\n"
+          "precision mediump float;\n"
+          "uniform samplerExternalOES u_texSampler;\n"
+          "varying vec2 v_uv;\n"
+          "void main(void) {\n"
+          "  gl_FragColor = texture2D(u_texSampler, v_uv.st);\n"
+          "}\n";
+    case FRAGMENT_SHADER_TEX_OES_FLIP_Y:
+      return
+          "#extension GL_OES_EGL_image_external : require\n"
+          "precision mediump float;\n"
+          "uniform samplerExternalOES u_texSampler;\n"
+          "varying vec2 v_uv;\n"
+          "void main(void) {\n"
+          "  gl_FragColor =\n"
+          "      texture2D(u_texSampler, vec2(v_uv.s, 1.0 - v_uv.t));\n"
+          "}\n";
+    case FRAGMENT_SHADER_TEX_OES_PREMULTIPLY_ALPHA:
+      return
+          "#extension GL_OES_EGL_image_external : require\n"
+          "precision mediump float;\n"
+          "uniform samplerExternalOES u_texSampler;\n"
+          "varying vec2 v_uv;\n"
+          "void main(void) {\n"
+          "  gl_FragColor = texture2D(u_texSampler, v_uv.st);\n"
+          "  gl_FragColor.rgb *= gl_FragColor.a;\n"
+          "}\n";
+    case FRAGMENT_SHADER_TEX_OES_UNPREMULTIPLY_ALPHA:
+      return
+          "#extension GL_OES_EGL_image_external : require\n"
+          "precision mediump float;\n"
+          "uniform samplerExternalOES u_texSampler;\n"
+          "varying vec2 v_uv;\n"
+          "void main(void) {\n"
+          "  gl_FragColor = texture2D(u_texSampler, v_uv.st);\n"
+          "  if (gl_FragColor.a > 0.0)\n"
+          "    gl_FragColor.rgb /= gl_FragColor.a;\n"
+          "}\n";
+    case FRAGMENT_SHADER_TEX_OES_PREMULTIPLY_ALPHA_FLIP_Y:
+      return
+          "#extension GL_OES_EGL_image_external : require\n"
+          "precision mediump float;\n"
+          "uniform samplerExternalOES u_texSampler;\n"
+          "varying vec2 v_uv;\n"
+          "void main(void) {\n"
+          "  gl_FragColor =\n"
+          "      texture2D(u_texSampler, vec2(v_uv.s, 1.0 - v_uv.t));\n"
+          "  gl_FragColor.rgb *= gl_FragColor.a;\n"
+          "}\n";
+    case FRAGMENT_SHADER_TEX_OES_UNPREMULTIPLY_ALPHA_FLIP_Y:
+      return
+          "#extension GL_OES_EGL_image_external : require\n"
+          "precision mediump float;\n"
+          "uniform samplerExternalOES u_texSampler;\n"
+          "varying vec2 v_uv;\n"
+          "void main(void) {\n"
+          "  gl_FragColor =\n"
+          "      texture2D(u_texSampler, vec2(v_uv.s, 1.0 - v_uv.t));\n"
+          "  if (gl_FragColor.a > 0.0)\n"
+          "    gl_FragColor.rgb /= gl_FragColor.a;\n"
+          "}\n";
     default:
       return 0;
   }
 }
 
 }  // namespace
 
+namespace gpu {
+
 void CopyTextureCHROMIUMResourceManager::Initialize() {
   COMPILE_ASSERT(
       kVertexPositionAttrib == 0u || kVertexTextureAttrib == 0u,
       CopyTexture_One_of_these_attribs_must_be_0);
 
   // Initialize all of the GPU resources required to perform the copy.
   glGenBuffersARB(2, buffer_ids_);
   glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[0]);
   glBufferData(GL_ARRAY_BUFFER, sizeof(kQuadVertices), kQuadVertices,
                GL_STATIC_DRAW);
@@ skipping 53 matching lines @@
 
   glDeleteFramebuffersEXT(1, &framebuffer_);
 
   for (int program = 0; program < kNumPrograms; ++program)
     glDeleteProgram(programs_[program]);
 
   glDeleteBuffersARB(2, buffer_ids_);
 }
 
 void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
-    GLenum target,
+    const gles2::GLES2Decoder* decoder,
+    GLenum source_target,
+    GLenum dest_target,
     GLuint source_id,
     GLuint dest_id,
     GLint level,
+    GLsizei width,
+    GLsizei height,
     bool flip_y,
     bool premultiply_alpha,
     bool unpremultiply_alpha) {
+  DCHECK(source_target == GL_TEXTURE_2D ||
+         source_target == GL_TEXTURE_EXTERNAL_OES);
   if (!initialized_) {
     DLOG(ERROR) << "CopyTextureCHROMIUM: Uninitialized manager.";
     return;
   }
 
-  GLuint program = GetProgram(flip_y, premultiply_alpha, unpremultiply_alpha);
+  GLuint program = GetProgram(
+      flip_y, premultiply_alpha, unpremultiply_alpha,
+      source_target == GL_TEXTURE_EXTERNAL_OES);
   glUseProgram(programs_[program]);
 
 #ifndef NDEBUG
   glValidateProgram(programs_[program]);
   GLint validation_status;
   glGetProgramiv(programs_[program], GL_VALIDATE_STATUS, &validation_status);
   if (GL_TRUE != validation_status) {
     DLOG(ERROR) << "CopyTextureCHROMIUM: Invalid shader.";
     return;
   }
 #endif
 
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, dest_id);
+  // NVidia drivers require texture settings to be a certain way
+  // or they won't report FRAMEBUFFER_COMPLETE.
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer_);
-  glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target,
+  glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, dest_target,
                             dest_id, level);
 
 #ifndef NDEBUG
   GLenum fb_status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
   if (GL_FRAMEBUFFER_COMPLETE != fb_status) {
     DLOG(ERROR) << "CopyTextureCHROMIUM: Incomplete framebuffer.";
-    return;
+  } else
+#endif
+  {
+    glEnableVertexAttribArray(kVertexPositionAttrib);
+    glEnableVertexAttribArray(kVertexTextureAttrib);
+
+    glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[0]);
+    glVertexAttribPointer(kVertexPositionAttrib, 4, GL_FLOAT, GL_FALSE,
+                          4 * sizeof(GLfloat), 0);
+
+    glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[1]);
+    glVertexAttribPointer(kVertexTextureAttrib,  2, GL_FLOAT, GL_FALSE,
+                          2 * sizeof(GLfloat), 0);
+
+    glUniform1i(sampler_locations_[program], 0);
+
+    glBindTexture(source_target, source_id);
+    glTexParameterf(source_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterf(source_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(source_target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(source_target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_SCISSOR_TEST);
+    glDisable(GL_STENCIL_TEST);
+    glDisable(GL_CULL_FACE);
+    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+    glDepthMask(GL_FALSE);
+    glDisable(GL_BLEND);
+
+    glViewport(0, 0, width, height);
+    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
   }
-#endif
 
-  glEnableVertexAttribArray(kVertexPositionAttrib);
-  glEnableVertexAttribArray(kVertexTextureAttrib);
-
-  glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[0]);
-  glVertexAttribPointer(kVertexPositionAttrib, 4, GL_FLOAT, GL_FALSE,
-                        4 * sizeof(GLfloat), 0);
-
-  glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[1]);
-  glVertexAttribPointer(kVertexTextureAttrib,  2, GL_FLOAT, GL_FALSE,
-                        2 * sizeof(GLfloat), 0);
-
-  glActiveTexture(GL_TEXTURE0);
-  glUniform1i(sampler_locations_[program], 0);
-
-  glBindTexture(GL_TEXTURE_2D, source_id);
-  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-
-  glDisable(GL_DEPTH_TEST);
-  glDisable(GL_SCISSOR_TEST);
-  glDisable(GL_STENCIL_TEST);
-  glDisable(GL_CULL_FACE);
-  glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-  glDepthMask(GL_FALSE);
-  glDisable(GL_BLEND);
-
-  glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+  decoder->RestoreAttribute(kVertexTextureAttrib);
+  decoder->RestoreAttribute(kVertexPositionAttrib);
+  decoder->RestoreTextureUnitBindings(0);
+  decoder->RestoreTextureState(source_id);
+  decoder->RestoreTextureState(dest_id);
+  decoder->RestoreActiveTexture();
+  decoder->RestoreProgramBindings();
+  decoder->RestoreBufferBindings();
+  decoder->RestoreFramebufferBindings();
+  decoder->RestoreGlobalState();
 }
 
+}  // namespace