8 // depth attachment is only read from
45 // Fill out a depth texture to specific values and use it both as a sampler and a depth texture
46 // with depth write disabled. This is to test a "read-only feedback loop" that needs to be
82     // Attach a color and depth texture to the FBO  in TEST_P()
90     // Set the color texture to blue and depth texture to 1.0f  in TEST_P()
96     // Enable Depth test with passing always to write depth.  in TEST_P()
101     // Fill the middle of the depth texture with 0.0f. while the border remains 1.0f as  in TEST_P()
117     // Enable Depth test without depth write.  in TEST_P()
133     // is also bound as the depth attachment, because depth write is disabled.  in TEST_P()
134     // The write to finalTex only succeeds for the middle region due to depth test.  in TEST_P()
137     // Copy finalTex to default framebuffer for verification. Depth values written in the first  in TEST_P()
152 // Tests that we can support a feedback loop between a depth textures and the depth buffer.
163 uniform sampler2D depth;  in TEST_P()
166     if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)  in TEST_P()
200     // Clear depth to 0.5.  in TEST_P()
204     // Disable depth. Although this does not remove the feedback loop as defined by the  in TEST_P()
209     // Verify we can sample the depth texture and get 0.5.  in TEST_P()
216 // Tests corner cases with read-only depth-stencil feedback loops.
226 uniform sampler2D depth;  in TEST_P()
229     if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)  in TEST_P()
273     // Clear depth to 0.5.  in TEST_P()
279     // Disable depth. Although this does not remove the feedback loop as defined by the  in TEST_P()
300 // Tests depth/stencil clear after read-only depth/stencil feedback loop draw.
310 uniform sampler2D depth;  in TEST_P()
313     if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)  in TEST_P()
352     // Clear depth to 0.5.  in TEST_P()
356     // Disable depth to establish read-only depth/stencil feedback loop.  in TEST_P()
360     // Verify we can sample the depth texture and get 0.5.  in TEST_P()
363     // Clear depth to another value  in TEST_P()
373     // Make sure depth is correctly cleared.  in TEST_P()
384 // Tests scissored depth/stencil clear after read-only depth/stencil feedback loop draw.
394 uniform sampler2D depth;  in TEST_P()
397     if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)  in TEST_P()
436     // Clear depth to 0.5.  in TEST_P()
440     // Disable depth to establish read-only depth/stencil feedback loop.  in TEST_P()
444     // Verify we can sample the depth texture and get 0.5.  in TEST_P()
447     // Clear depth to another value in a scissor  in TEST_P()
459     // Make sure depth is correctly cleared.  in TEST_P()
471 // Tests depth/stencil blit after read-only depth/stencil feedback loop draw.
481 uniform sampler2D depth;  in TEST_P()
484     if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)  in TEST_P()
523     // Clear depth to 0.5.  in TEST_P()
527     // Disable depth to establish read-only depth/stencil feedback loop.  in TEST_P()
531     // Verify we can sample the depth texture and get 0.5.  in TEST_P()
534     // Blit depth to another framebuffer.  in TEST_P()
560     // Make sure depth is correctly blitted.  in TEST_P()
579 // Tests that if the framebuffer is cleared, a feedback loop between a depth textures and the depth
591 uniform sampler2D depth;  in TEST_P()
594     if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)  in TEST_P()
628     // Clear color to blue and depth to 0.5.  in TEST_P()
633     // Disable depth. Although this does not remove the feedback loop as defined by the  in TEST_P()
638     // Verify we can sample the depth texture and get 0.5.  Use a scissor.  in TEST_P()
644     // Make sure the scissored region passes the depth test and is changed to green.  in TEST_P()
657 // Tests that sampling from stencil while simultaneously bound as read-only attachment works.  Depth
665     // Create FBO with color, depth and stencil  in TEST_P()
682     // Initialize depth/stencil  in TEST_P()
698     // Draw red with depth = 1 and stencil = 0xAA  in TEST_P()
771     // Validate that depth was overwritten in the previous render pass  in TEST_P()
784 // Tests that sampling from depth while simultaneously bound as read-only attachment works.  Stencil
792     // Create FBO with color, depth and stencil  in TEST_P()
809     // Initialize depth/stencil  in TEST_P()
825     // Draw red with depth = 1 and stencil = 0xAA  in TEST_P()
837     // Disable depth output and bind depth as sampler.  in TEST_P()
859 uniform sampler2D depth;  in TEST_P()
865     bool depthPass = abs(texture(depth, texCoord).x - 1.0) < 0.1;  in TEST_P()
880     glUniform1i(glGetUniformLocation(validateDepth, "depth"), 0);  in TEST_P()
910 // Tests that sampling from depth and stencil while simultaneously bound as read-only attachment
918     // Create FBO with color, depth and stencil  in TEST_P()
935     // Initialize depth/stencil  in TEST_P()
951     // Draw red with depth = 1 and stencil = 0xAA  in TEST_P()
963     // Disable depth/stencil output and bind both depth and stencil as samplers.  in TEST_P()
986 uniform sampler2D depth;  in TEST_P()
993     // Note: Due to GL_DEPTH_STENCIL_TEXTURE_MODE, it is not possible to read both the depth and  in TEST_P()
995     // sample from depth.  in TEST_P()
996     bool depthPass = !isinf(texture(depth, texCoord).x);  in TEST_P()
1017     glUniform1i(glGetUniformLocation(validateDepthStencil, "depth"), 0);  in TEST_P()