kc3-lang/angle/src/tests/gl_tests/FragDepthTest.cpp

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• Hash : 1bfeb8a5
  Author :
  Date : 2025-03-03T00:00:00
  

  D3D11: Set SV_Position interpolation for conservative depth
  
  HLSL requires centroid interpolation for PS input
  position if conservative depth output is used and
  the shader is executing at pixel-frequency.
  
  Bug: angleproject:397720825
  Change-Id: I2b314e39e40a63cb58e2bdef99ffa842ddaaff0d
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6336827
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>
  

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• src/tests/gl_tests/FragDepthTest.cpp

• //
  // Copyright 2022 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // FragDepthTest:
  //   Tests the correctness of gl_FragDepth usage.
  //
  
  #include "test_utils/ANGLETest.h"
  #include "test_utils/gl_raii.h"
  
  using namespace angle;
  
  class FragDepthTest : public ANGLETest<>
  {
    protected:
      struct FragDepthTestResources
      {
          GLuint program;
          GLint depthLocation;
          GLTexture colorTexture;
          GLTexture depthTexture;
          GLFramebuffer framebuffer;
      };
  
      void setupResources(FragDepthTestResources &resources)
      {
  
          // Writes a fixed depth value and green.
          constexpr char kFS[] =
              R"(#version 300 es
              precision highp float;
              layout(location = 0) out vec4 fragColor;
              uniform float u_depth;
              void main(){
                  gl_FragDepth = u_depth;
                  fragColor = vec4(0.0, 1.0, 0.0, 1.0);
              })";
  
          resources.program       = CompileProgram(essl3_shaders::vs::Simple(), kFS);
          resources.depthLocation = glGetUniformLocation(resources.program, "u_depth");
  
          glBindTexture(GL_TEXTURE_2D, resources.colorTexture);
          glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 1, 1);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  
          glBindTexture(GL_TEXTURE_2D, resources.depthTexture);
          glTexStorage2D(GL_TEXTURE_2D, 1, GL_DEPTH_COMPONENT32F, 1, 1);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  
          glBindFramebuffer(GL_FRAMEBUFFER, resources.framebuffer);
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                                 resources.colorTexture, 0);
      }
  
      void cleanupResources(FragDepthTestResources &resources) { glDeleteProgram(resources.program); }
  
      void checkDepthWritten(float expectedDepth, float fsDepth, bool bindDepthBuffer)
      {
          FragDepthTestResources resources;
          setupResources(resources);
          ASSERT_NE(0u, resources.program);
          ASSERT_NE(-1, resources.depthLocation);
          ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
          ASSERT_GL_NO_ERROR();
  
          glBindFramebuffer(GL_FRAMEBUFFER, resources.framebuffer);
          if (bindDepthBuffer)
          {
              glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
                                     resources.depthTexture, 0);
              EXPECT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
  
              // Clear to the expected depth so it will be compared to the FS depth with
              // DepthFunc(GL_EQUAL)
              glClearDepthf(expectedDepth);
              glDepthFunc(GL_EQUAL);
              glEnable(GL_DEPTH_TEST);
          }
          else
          {
              glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
              EXPECT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
              glDisable(GL_DEPTH_TEST);
          }
          glUseProgram(resources.program);
  
          // Clear to red, the FS will write green on success
          glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
          // Clear to the expected depth so it will be compared to the FS depth with
          // DepthFunc(GL_EQUAL)
  
          glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
          glUniform1f(resources.depthLocation, fsDepth);
  
          drawQuad(resources.program, "a_position", 0.0f);
          EXPECT_GL_NO_ERROR();
  
          EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
          cleanupResources(resources);
      }
  };
  
  // Test that writing to gl_FragDepth works
  TEST_P(FragDepthTest, DepthBufferBound)
  {
      checkDepthWritten(0.5f, 0.5f, true);
  }
  
  // Test that writing to gl_FragDepth with no depth buffer works.
  TEST_P(FragDepthTest, DepthBufferUnbound)
  {
      // Depth test is disabled, so the expected depth should not matter.
      checkDepthWritten(0.f, 0.5f, false);
  }
  
  // Test that fragment shader depth writes to a no-depth framebuffer do not fail
  // after using a depth-enabled framebuffer with the same program.
  TEST_P(FragDepthTest, SwitchToNoDepthFramebuffer)
  {
      constexpr char kFS[] = R"(#version 300 es
      out highp vec4 color;
      void main() {
        color = vec4(1.0, 0.0, 0.0, 1.0);
        gl_FragDepth = 1.0;
      })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
  
      // Draw to a depth-enabled framebuffer first
      GLFramebuffer fbo1;
      glBindFramebuffer(GL_FRAMEBUFFER, fbo1);
  
      GLRenderbuffer rb10;
      glBindRenderbuffer(GL_RENDERBUFFER, rb10);
      glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 128, 128);
      glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rb10);
  
      GLRenderbuffer rb1d;
      glBindRenderbuffer(GL_RENDERBUFFER, rb1d);
      glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT32F, 128, 128);
      glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rb1d);
  
      EXPECT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
  
      drawQuad(program, "a_position", 0.0f);
      EXPECT_GL_NO_ERROR();
  
      // Draw to a no-depth framebuffer using the same program
      GLFramebuffer fbo2;
      glBindFramebuffer(GL_FRAMEBUFFER, fbo2);
  
      GLRenderbuffer rb20;
      glBindRenderbuffer(GL_RENDERBUFFER, rb20);
      glRenderbufferStorage(GL_RENDERBUFFER, GL_R8, 64, 64);
      glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rb20);
  
      EXPECT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
  
      drawQuad(program, "a_position", 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  class FragDepthRedeclarationTest : public ANGLETest<>
  {};
  
  // Test gl_FragDepth redeclared as vertex output
  TEST_P(FragDepthRedeclarationTest, VSOutput)
  {
      constexpr char kVS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: enable
  out highp float gl_FragDepth;
  void main() {
      gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
      gl_FragDepth = 1.0;
  })";
  
      GLProgram prg;
      prg.makeRaster(kVS, essl3_shaders::fs::Red());
      EXPECT_FALSE(prg.valid());
  }
  
  // Test gl_FragDepth redeclared as fragment input
  TEST_P(FragDepthRedeclarationTest, FSInput)
  {
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: enable
  out highp vec4 color;
  in highp float gl_FragDepth;
  void main() {
      color = vec4(gl_FragDepth, 0.0, 0.0, 1.0);
  })";
  
      GLProgram prg;
      prg.makeRaster(essl3_shaders::vs::Simple(), kFS);
      EXPECT_FALSE(prg.valid());
  }
  
  // Test gl_FragDepth redeclaration with no layout qualifier
  TEST_P(FragDepthRedeclarationTest, NoLayout)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = 1.0;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_any layout qualifier
  TEST_P(FragDepthRedeclarationTest, Any)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_any) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = 1.0;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_greater layout qualifier
  TEST_P(FragDepthRedeclarationTest, Greater)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_greater) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = 1.0;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_less layout qualifier
  TEST_P(FragDepthRedeclarationTest, Less)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_less) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = 1.0;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_unchanged layout qualifier
  TEST_P(FragDepthRedeclarationTest, Unchanged)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_unchanged) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = 1.0;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_any layout qualifier and gl_FragCoord
  TEST_P(FragDepthRedeclarationTest, AnyWithFragCoord)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_any) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = cos(gl_FragCoord.z);
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_greater layout qualifier and gl_FragCoord
  TEST_P(FragDepthRedeclarationTest, GreaterWithFragCoord)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_greater) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = gl_FragCoord.z + 0.5;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_less layout qualifier and gl_FragCoord
  TEST_P(FragDepthRedeclarationTest, LessWithFragCoord)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_less) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = gl_FragCoord.z - 0.5;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  // Test gl_FragDepth redeclaration with depth_unchanged layout qualifier and gl_FragCoord
  TEST_P(FragDepthRedeclarationTest, UnchangedWithFragCoord)
  {
      ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_conservative_depth"));
  
      constexpr char kFS[] = R"(#version 300 es
  #extension GL_EXT_conservative_depth: require
  out highp vec4 color;
  layout (depth_unchanged) out highp float gl_FragDepth;
  void main() {
      color = vec4(1.0, 0.0, 0.0, 1.0);
      gl_FragDepth = gl_FragCoord.z;
  })";
  
      ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);
      drawQuad(program, essl3_shaders::PositionAttrib(), 0.0f);
      EXPECT_GL_NO_ERROR();
  }
  
  GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(FragDepthTest);
  ANGLE_INSTANTIATE_TEST_ES3(FragDepthTest);
  
  GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(FragDepthRedeclarationTest);
  ANGLE_INSTANTIATE_TEST_ES3(FragDepthRedeclarationTest);
  

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