Plum through ANGLE_depth_texture

gpu/command_buffer/tests/gl_depth_texture_unittest.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 <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include "gpu/command_buffer/tests/gl_manager.h"
+#include "gpu/command_buffer/tests/gl_test_utils.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#define SHADER(Src) #Src
+
+namespace gpu {
+
+class DepthTextureTest : public testing::Test {
+ protected:
+  static const GLsizei kResolution = 64;
+  virtual void SetUp() {
+    gl_.Initialize(gfx::Size(kResolution, kResolution));
+  }
+
+  virtual void TearDown() {
+    gl_.Destroy();
+  }
+
+  GLuint SetupUnitQuad(GLint position_location);
+
+  GLManager gl_;
+};
+
+
+
+GLuint DepthTextureTest::SetupUnitQuad(GLint position_location) {
+  GLuint vbo = 0;
+  glGenBuffers(1, &vbo);
+  glBindBuffer(GL_ARRAY_BUFFER, vbo);
+  static float vertices[] = {
+      1.0f,  1.0f,  1.0f,
+     -1.0f,  1.0f,  0.0f,
+     -1.0f, -1.0f, -1.0f,
+      1.0f,  1.0f,  1.0f,
+     -1.0f, -1.0f, -1.0f,
+      1.0f, -1.0f,  0.0f,
+  };
+  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+  glEnableVertexAttribArray(position_location);
+  glVertexAttribPointer(position_location, 3, GL_FLOAT, GL_FALSE, 0, 0);
+
+  return vbo;
+}
+
+namespace {
+
+struct FormatType {
+  GLenum format;
+  GLenum type;
+};
+
+}  // anonymous namespace
+
+TEST_F(DepthTextureTest, RenderTo) {
+  if (!GLTestHelper::HasExtension("GL_CHROMIUM_depth_texture")) {
+    return;
+  }
+
+  bool have_depth_stencil = GLTestHelper::HasExtension(
+      "GL_OES_packed_depth_stencil");
+
+  static const char* v_shader_str = SHADER(
+      attribute vec4 v_position;
+      void main()
+      {
+         gl_Position = v_position;
+      }
+  );
+  static const char* f_shader_str = SHADER(
+      precision mediump float;
+      uniform sampler2D u_texture;
+      uniform vec2 u_resolution;
+      void main()
+      {
+        vec2 texcoord = gl_FragCoord.xy / u_resolution;
+        gl_FragColor = texture2D(u_texture, texcoord);
+      }
+  );
+
+  GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
+
+  GLint position_loc = glGetAttribLocation(program, "v_position");
+  GLint resolution_loc = glGetUniformLocation(program, "u_resolution");
+
+  SetupUnitQuad(position_loc);
+
+  // Depth test needs to be on for the depth buffer to be updated.
+  glEnable(GL_DEPTH_TEST);
+
+  // create an fbo
+  GLuint fbo = 0;
+  glGenFramebuffers(1, &fbo);
+  glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+  // create a depth texture.
+  GLuint color_texture = 0;
+  GLuint depth_texture = 0;
+
+  glGenTextures(1, &color_texture);
+  glBindTexture(GL_TEXTURE_2D, color_texture);
+  glTexImage2D(
+      GL_TEXTURE_2D, 0, GL_RGBA, kResolution, kResolution,
+      0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+  glFramebufferTexture2D(
+      GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color_texture, 0);
+
+  glGenTextures(1, &depth_texture);
+  glBindTexture(GL_TEXTURE_2D, depth_texture);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glFramebufferTexture2D(
+      GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth_texture, 0);
+
+  glUseProgram(program);
+  glUniform2f(resolution_loc, kResolution, kResolution);
+
+  static const FormatType format_types[] = {
+    { GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT, },
+    { GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, },
+    { GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, },
+  };
+  for (size_t ii = 0; ii < arraysize(format_types); ++ii) {
+    GLenum format = format_types[ii].format;
+    GLenum type = format_types[ii].type;
+
+    if (format == GL_DEPTH_STENCIL_OES && !have_depth_stencil) {
+      continue;
+    }
+
+    glBindTexture(GL_TEXTURE_2D, depth_texture);
+    glTexImage2D(
+        GL_TEXTURE_2D, 0, format, kResolution, kResolution,
+        0, format, type, NULL);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+    EXPECT_TRUE(
+        glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
+
+    GLTestHelper::CheckGLError("no errors", __LINE__);
+
+    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    // Disconnect the texture so we'll render with the default texture.
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    // Render to the fbo.
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+
+    // Render with the depth texture.
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glBindTexture(GL_TEXTURE_2D, depth_texture);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+
+    uint8 actual_pixels[kResolution * kResolution * 4] = { 0, };
+    glReadPixels(
+        0, 0, kResolution, kResolution, GL_RGBA, GL_UNSIGNED_BYTE,
+        actual_pixels);
+
+    // Check that each pixel's RGB are the same and that it's value is less
+    // than the previous pixel in either direction. Basically verify we have a
+    // gradient.
+    for (GLint yy = 0; yy < kResolution; ++yy) {
+      for (GLint xx = 0; xx < kResolution; ++xx) {
+        const uint8* actual = &actual_pixels[(yy * kResolution + xx) * 4];
+        const uint8* left = actual - 4;
+        const uint8* down = actual - kResolution * 4;
+
+        EXPECT_EQ(actual[0], actual[1]);
+        EXPECT_EQ(actual[1], actual[2]);
+        EXPECT_EQ(0xFF, actual[3]);
+
+        if (xx > 0) {
+          EXPECT_GT(actual[0], left[0]);
+        }
+        if (yy > 0) {
+          EXPECT_GT(actual[0], down[0]);
+        }
+      }
+    }
+
+    // Check that bottom left corner is vastly different thatn top right.
+    EXPECT_GT(
+        actual_pixels[(kResolution * kResolution - 1) * 4] - actual_pixels[0],
+        0xC0);
+    GLTestHelper::CheckGLError("no errors", __LINE__);
+  }
+}
+
+}  // namespace gpu
+
+
+