[Piglit] Patch to test for ARB_clip_control

Brian Paul brianp at vmware.com
Wed Oct 22 14:31:43 PDT 2014


On 10/22/2014 10:59 AM, Mathias Fröhlich wrote:
>
> Hi,
>
> The attached patch adds a test for ARB_clip_control.
> Please review!

I just did a quick read-through and found a few things...


>
> From 05c1b406510a5c71f16674c83ed894a17c5e5796 Mon Sep 17 00:00:00 2001
> Message-Id: <05c1b406510a5c71f16674c83ed894a17c5e5796.1413996915.git.Mathias.Froehlich at gmx.net>
> From: =?UTF-8?q?Mathias=20Fr=C3=B6hlich?= <Mathias.Froehlich at gmx.net>
> Date: Mon, 15 Sep 2014 21:42:07 +0200
> Subject: [PATCH] Add test for ARB_clip_control.
>
> ---
>  registry/gl.xml                                    |  23 ++-
>  tests/spec/CMakeLists.txt                          |   1 +
>  tests/spec/arb_clip_control/CMakeLists.gl.txt      |  15 ++
>  tests/spec/arb_clip_control/CMakeLists.txt         |   1 +
>  .../clip-control-depth-precision.c                 | 164 ++++++++++++++++
>  tests/spec/arb_clip_control/clip-control.c         | 218 +++++++++++++++++++++
>  6 files changed, 421 insertions(+), 1 deletion(-)
>  create mode 100644 tests/spec/arb_clip_control/CMakeLists.gl.txt
>  create mode 100644 tests/spec/arb_clip_control/CMakeLists.txt
>  create mode 100644 tests/spec/arb_clip_control/clip-control-depth-precision.c
>  create mode 100644 tests/spec/arb_clip_control/clip-control.c
>
> diff --git a/registry/gl.xml b/registry/gl.xml
> index 30e8d9f..d432d3d 100644
> --- a/registry/gl.xml
> +++ b/registry/gl.xml
> @@ -7916,7 +7916,12 @@ typedef unsigned int GLhandleARB;
>          <enum value="0x934A" name="GL_LOCATION_COMPONENT"/>
>          <enum value="0x934B" name="GL_TRANSFORM_FEEDBACK_BUFFER_INDEX"/>
>          <enum value="0x934C" name="GL_TRANSFORM_FEEDBACK_BUFFER_STRIDE"/>
> -            <unused start="0x934D" end="0x9364"/>
> +            <unused start="0x934D" end="0x935B"/>
> +        <enum value="0x935C" name="GL_CLIP_ORIGIN"/>
> +        <enum value="0x935D" name="GL_CLIP_DEPTH_MODE"/>
> +        <enum value="0x935E" name="GL_NEGATIVE_ONE_TO_ONE"/>
> +        <enum value="0x935F" name="GL_ZERO_TO_ONE"/>
> +            <unused start="0x9360" end="0x9364"/>
>          <enum value="0x9365" name="GL_CLEAR_TEXTURE"/>
>              <unused start="0x9366" end="0x937F"/>
>      </enums>
> @@ -9085,6 +9090,11 @@ typedef unsigned int GLhandleARB;
>              <glx type="render" opcode="2"/>
>          </command>
>          <command>
> +            <proto>void <name>glClipControl</name></proto>
> +            <param><ptype>GLenum</ptype> <name>origin</name></param>
> +            <param><ptype>GLenum</ptype> <name>depth</name></param>
> +        </command>
> +        <command>
>              <proto><ptype>GLenum</ptype> <name>glCheckFramebufferStatus</name></proto>
>              <param group="FramebufferTarget"><ptype>GLenum</ptype> <name>target</name></param>
>              <glx type="vendor" opcode="1427"/>
> @@ -33515,6 +33525,17 @@ typedef unsigned int GLhandleARB;
>                  <command name="glClearTexSubImage"/>
>              </require>
>          </extension>
> +        <extension name="GL_ARB_clip_control" supported="gl">
> +            <require>
> +                <enum name="GL_LOWER_LEFT"/>
> +                <enum name="GL_UPPER_LEFT"/>
> +                <enum name="GL_NEGATIVE_ONE_TO_ONE"/>
> +                <enum name="GL_ZERO_TO_ONE"/>
> +                <enum name="GL_CLIP_ORIGIN"/>
> +                <enum name="GL_CLIP_DEPTH_MODE"/>
> +                <command name="glClipControl"/>
> +            </require>
> +        </extension>
>          <extension name="GL_ARB_color_buffer_float" supported="gl">
>              <require>
>                  <enum name="GL_RGBA_FLOAT_MODE_ARB"/>
> diff --git a/tests/spec/CMakeLists.txt b/tests/spec/CMakeLists.txt
> index 62e6487..1be8089 100644
> --- a/tests/spec/CMakeLists.txt
> +++ b/tests/spec/CMakeLists.txt
> @@ -3,6 +3,7 @@ add_subdirectory (arb_base_instance)
>  add_subdirectory (arb_buffer_storage)
>  add_subdirectory (arb_clear_buffer_object)
>  add_subdirectory (arb_clear_texture)
> +add_subdirectory (arb_clip_control)
>  add_subdirectory (arb_color_buffer_float)
>  add_subdirectory (arb_copy_image)
>  add_subdirectory (arb_compute_shader)
> diff --git a/tests/spec/arb_clip_control/CMakeLists.gl.txt b/tests/spec/arb_clip_control/CMakeLists.gl.txt
> new file mode 100644
> index 0000000..3951bfb
> --- /dev/null
> +++ b/tests/spec/arb_clip_control/CMakeLists.gl.txt
> @@ -0,0 +1,15 @@
> +include_directories(
> +	${GLEXT_INCLUDE_DIR}
> +	${OPENGL_INCLUDE_PATH}
> +)
> +
> +link_libraries (
> +	piglitutil_${piglit_target_api}
> +	${OPENGL_gl_LIBRARY}
> +	${OPENGL_glu_LIBRARY}
> +)
> +
> +piglit_add_executable (clip-control clip-control.c)
> +piglit_add_executable (clip-control-depth-precision clip-control-depth-precision.c)
> +
> +# vim: ft=cmake:
> diff --git a/tests/spec/arb_clip_control/CMakeLists.txt b/tests/spec/arb_clip_control/CMakeLists.txt
> new file mode 100644
> index 0000000..144a306
> --- /dev/null
> +++ b/tests/spec/arb_clip_control/CMakeLists.txt
> @@ -0,0 +1 @@
> +piglit_include_target_api()
> diff --git a/tests/spec/arb_clip_control/clip-control-depth-precision.c b/tests/spec/arb_clip_control/clip-control-depth-precision.c
> new file mode 100644
> index 0000000..7e969f9
> --- /dev/null
> +++ b/tests/spec/arb_clip_control/clip-control-depth-precision.c
> @@ -0,0 +1,164 @@
> +/*
> + * Copyright Mathias Fröhlich <Mathias.Froehlich at web.de>
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Authors:
> + *    Mathias Fröhlich <Mathias.Froehlich at web.de>
> + */
> +
> +/** @file clip-control-depth-precision.c
> + *
> + * Test for NV_depth_buffer_float not clamping the near and far values.
> + * This is actually the application level use case setting up a
> + * projection matrix with and infinite far away far plane and a near plane
> + * at 1.

Wrong comments?


> + */
> +
> +#include "piglit-util-gl.h"
> +
> +PIGLIT_GL_TEST_CONFIG_BEGIN
> +
> +	config.supports_gl_compat_version = 20;
> +
> +	config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
> +
> +PIGLIT_GL_TEST_CONFIG_END
> +
> +void
> +piglit_init(int argc, char **argv)
> +{
> +	GLdouble projection[16] = { 0.0, };
> +
> +	piglit_require_extension("GL_ARB_clip_control");
> +	piglit_require_extension("GL_EXT_framebuffer_object");
> +	piglit_require_extension("GL_EXT_framebuffer_blit");
> +
> +	/* Set up a projection matrix mapping z = -1 to z = 1
> +	 * and z = -inf to z = 0 in projection space.
> +	 * Given the clip control setting below, this is just
> +	 * written as is into the float depth buffer.
> +	 */
> +	projection[0 + 4*0] = 1;
> +	projection[1 + 4*1] = (GLdouble)piglit_width/piglit_height;
> +	projection[2 + 4*3] = 1;
> +	projection[3 + 4*2] = -1;
> +
> +	glMatrixMode(GL_PROJECTION);
> +	glLoadMatrixd(projection);
> +
> +	glMatrixMode(GL_MODELVIEW);
> +	glLoadIdentity();
> +}
> +
> +void
> +quad(double px, double py, double pz, double size)
> +{
> +	glBegin(GL_QUADS);
> +	glVertex3d(px - 0.5*size, py - 0.5*size, pz);
> +	glVertex3d(px + 0.5*size, py - 0.5*size, pz);
> +	glVertex3d(px + 0.5*size, py + 0.5*size, pz);
> +	glVertex3d(px - 0.5*size, py + 0.5*size, pz);
> +	glEnd();
> +}
> +
> +enum piglit_result
> +piglit_display(void)
> +{
> +	GLfloat red[3] = { 1, 0, 0 };
> +	GLfloat green[3] = { 0, 1, 0 };
> +	GLboolean pass = GL_TRUE;
> +	GLuint fb, cb, db;
> +	GLenum status;
> +	int range10;
> +
> +	glGenRenderbuffers(1, &cb);
> +	glBindRenderbuffer(GL_RENDERBUFFER, cb);
> +	glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA, piglit_width, piglit_height);
> +	glBindRenderbuffer(GL_RENDERBUFFER, 0);
> +
> +	glGenRenderbuffers(1, &db);
> +	glBindRenderbuffer(GL_RENDERBUFFER, db);
> +	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT32F, piglit_width, piglit_height);

I think you'll need to require GL_ARB_depth_buffer_float or use a 
different format.


> +	glBindRenderbuffer(GL_RENDERBUFFER, 0);
> +
> +	glGenFramebuffers(1, &fb);
> +	glBindFramebuffer(GL_FRAMEBUFFER, fb);
> +	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, cb);
> +	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, db);
> +
> +	status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
> +	if (status != GL_FRAMEBUFFER_COMPLETE) {
> +		printf("FBO incomplete status 0x%X\n", status);
> +		piglit_report_result(PIGLIT_FAIL);
> +	}
> +
> +	glClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE);
> +	glClearDepth(0);
> +	glDepthRange(0, 1);
> +	glClearColor(0, 0, 0, 1);
> +	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> +	glEnable(GL_DEPTH_TEST);
> +	glDepthFunc(GL_GREATER);
> +

I think you we some comments here explaining exactly what's going on 
here.  What's the testing strategy?


> +	for (range10 = 0; range10 < 16; ++range10) {
> +		int width = piglit_width/4;
> +		int height = piglit_height/4;
> +		int tilex = range10 % 4;
> +		int tiley = range10 / 4;
> +		int x = tilex*width;
> +		int y = tiley*height;
> +		double z = pow(10, 1 + range10);
> +
> +		/* Set up a new viewport for each deoth we want to test */

"depth"


> +		glViewport(x, y, width, height);
> +
> +		/* Draw a red surface at given distance z */
> +		glColor3fv(red);
> +		quad(0, 0, -z, z);
> +
> +		pass = piglit_probe_pixel_rgb(x + width/2, y + height/2, red) && pass;
> +
> +		/* And a green one just close in front of that red one */
> +		glColor3fv(green);
> +		quad(0, 0, (10*FLT_EPSILON - 1)*z, 0.5*z);
> +		quad(0, 0, -z, 0.5*z);
> +
> +		pass = piglit_probe_pixel_rgb(x + width/2, y + height/2, green) && pass;
> +	}
> +
> +	/* copy the result to the back buffer */

Maybe move that comment down to where the blit happens?


> +
> +	/* set viewport to window size */
> +	glViewport(0, 0, piglit_width, piglit_height);
> +
> +	glBindFramebuffer(GL_READ_FRAMEBUFFER, fb);
> +	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
> +	glBlitFramebuffer(0, 0, piglit_width, piglit_height, 0, 0, piglit_width, piglit_height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
> +	glBindFramebuffer(GL_FRAMEBUFFER, 0);
> +
> +	glDeleteFramebuffers(1, &fb);
> +	glDeleteRenderbuffers(1, &cb);
> +	glDeleteRenderbuffers(1, &db);
> +
> +	piglit_present_results();
> +
> +	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
> +}
> diff --git a/tests/spec/arb_clip_control/clip-control.c b/tests/spec/arb_clip_control/clip-control.c
> new file mode 100644
> index 0000000..f360c59
> --- /dev/null
> +++ b/tests/spec/arb_clip_control/clip-control.c
> @@ -0,0 +1,218 @@
> +/*
> + * Copyright Mathias Fröhlich <Mathias.Froehlich at web.de>
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Authors:
> + *    Mathias Fröhlich <Mathias.Froehlich at web.de>
> + */
> +
> +/** @file clip-control.c
> + *
> + * Basic test for ARB_clip_contol.
> + */
> +
> +#include "piglit-util-gl.h"
> +
> +PIGLIT_GL_TEST_CONFIG_BEGIN
> +
> +	config.supports_gl_compat_version = 20;
> +
> +	config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH;
> +
> +PIGLIT_GL_TEST_CONFIG_END
> +
> +void
> +piglit_init(int argc, char **argv)
> +{
> +	piglit_require_extension("GL_ARB_clip_control");
> +
> +	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
> +}
> +
> +void
> +quad(float base_x, float base_y, float z)
> +{
> +	glBegin(GL_QUADS);
> +	glVertex3f(base_x,	base_y,	     z);
> +	glVertex3f(base_x + 10, base_y,	     z);
> +	glVertex3f(base_x + 10, base_y + 10, z);
> +	glVertex3f(base_x,	base_y + 10, z);
> +	glEnd();
> +}
> +
> +enum piglit_result
> +piglit_display(void)
> +{
> +	GLboolean pass = GL_TRUE;
> +	GLint value;
> +
> +	/* The initial values */
> +	glGetIntegerv(GL_CLIP_ORIGIN, &value);
> +	pass = pass && (value == GL_LOWER_LEFT);
> +	glGetIntegerv(GL_CLIP_DEPTH_MODE, &value);
> +	pass = pass && (value == GL_NEGATIVE_ONE_TO_ONE);

If any of these fail, there's no indication about which one.  You could 
have a helper function for reporting the state being queried, the 
expected value and the actual value.

Or at least put all the glGetIntegerv tests in a separate function that 
will report that something failed.


> +
> +	glClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE);
> +	glGetIntegerv(GL_CLIP_ORIGIN, &value);
> +	pass = pass && (value == GL_LOWER_LEFT);
> +	glGetIntegerv(GL_CLIP_DEPTH_MODE, &value);
> +	pass = pass && (value == GL_ZERO_TO_ONE);
> +
> +	glClipControl(GL_UPPER_LEFT, GL_ZERO_TO_ONE);
> +	glGetIntegerv(GL_CLIP_ORIGIN, &value);
> +	pass = pass && (value == GL_UPPER_LEFT);
> +	glGetIntegerv(GL_CLIP_DEPTH_MODE, &value);
> +	pass = pass && (value == GL_ZERO_TO_ONE);
> +
> +	glClipControl(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
> +	glGetIntegerv(GL_CLIP_ORIGIN, &value);
> +	pass = pass && (value == GL_UPPER_LEFT);
> +	glGetIntegerv(GL_CLIP_DEPTH_MODE, &value);
> +	pass = pass && (value == GL_NEGATIVE_ONE_TO_ONE);
> +
> +	piglit_reset_gl_error();

Maybe check here that non of the preceding calls generated an error.


> +	glClipControl(GL_RGB, GL_NEGATIVE_ONE_TO_ONE);
> +	pass && piglit_check_gl_error(GL_INVALID_ENUM);
> +
> +	piglit_reset_gl_error();
> +	glClipControl(GL_LOWER_LEFT, GL_RGB);
> +	pass && piglit_check_gl_error(GL_INVALID_ENUM);
> +

I think the rendering test should go in a separate function.


> +	/* Now prepare the draw buffer */
> +	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> +	glEnable(GL_DEPTH_TEST);
> +
> +	/* Also test the winding order logic */
> +	glEnable(GL_CULL_FACE);
> +	glCullFace(GL_BACK);
> +
> +	/* Back to default */
> +	glClipControl(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
> +
> +	/* inside the clip space */
> +	quad(10, 10, 1.0);
> +	quad(10, 30, 0.5);
> +	quad(10, 50, 0.0);
> +	quad(10, 70, -0.5);
> +
> +	/* outside the clip space */
> +	quad(10, 90, 1.5);
> +	quad(10, 110, -1.5);
> +
> +	glClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE);
> +
> +	/* inside the clip space */
> +	quad(30, 10, 0.0);
> +	quad(30, 30, -0.25);
> +	quad(30, 50, -0.5);
> +	quad(30, 70, -0.75);
> +
> +	/* outside the clip space */
> +	quad(30, 90, 0.25);
> +	quad(30, 110, -1.25);
> +
> +	glClipControl(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
> +
> +	/* inside the clip space */
> +	quad(50, piglit_height - 20, 1.0);
> +	quad(50, piglit_height - 40, 0.5);
> +	quad(50, piglit_height - 60, 0.0);
> +	quad(50, piglit_height - 80, -0.5);
> +
> +	/* outside the clip space */
> +	quad(50, piglit_height - 100, 1.5);
> +	quad(50, piglit_height - 120, -1.5);
> +
> +	glClipControl(GL_UPPER_LEFT, GL_ZERO_TO_ONE);
> +
> +	/* inside the clip space */
> +	quad(70, piglit_height - 20, 0.0);
> +	quad(70, piglit_height - 40, -0.25);
> +	quad(70, piglit_height - 60, -0.5);
> +	quad(70, piglit_height - 80, -0.75);
> +
> +	/* outside the clip space */
> +	quad(70, piglit_height - 100, 0.25);
> +	quad(70, piglit_height - 120, -1.25);
> +
> +	/* Back to default */
> +	glClipControl(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
> +
> +	/* The clear value */
> +	pass = piglit_probe_pixel_depth(5, 5, 1.0) && pass;
> +
> +	/* The few patches drawn above */
> +
> +	/* glClipControl(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE); */
> +
> +	/* the written depth value */
> +	pass = piglit_probe_pixel_depth(15, 15, 0.0) && pass;
> +	pass = piglit_probe_pixel_depth(15, 35, 0.25) && pass;
> +	pass = piglit_probe_pixel_depth(15, 55, 0.5) && pass;
> +	pass = piglit_probe_pixel_depth(15, 75, 0.75) && pass;
> +
> +	/* still the clear value */
> +	pass = piglit_probe_pixel_depth(15, 95, 1.0) && pass;
> +	pass = piglit_probe_pixel_depth(15, 115, 1.0) && pass;
> +
> +
> +	/* glClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE); */
> +
> +	/* the written depth value */
> +	pass = piglit_probe_pixel_depth(35, 15, 0.0) && pass;
> +	pass = piglit_probe_pixel_depth(35, 35, 0.25) && pass;
> +	pass = piglit_probe_pixel_depth(35, 55, 0.5) && pass;
> +	pass = piglit_probe_pixel_depth(35, 75, 0.75) && pass;
> +
> +	/* still the clear value */
> +	pass = piglit_probe_pixel_depth(35, 95, 1.0) && pass;
> +	pass = piglit_probe_pixel_depth(35, 115, 1.0) && pass;
> +
> +
> +	/* glClipControl(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE); */
> +
> +	/* the written depth value */
> +	pass = piglit_probe_pixel_depth(55, 15, 0.0) && pass;
> +	pass = piglit_probe_pixel_depth(55, 35, 0.25) && pass;
> +	pass = piglit_probe_pixel_depth(55, 55, 0.5) && pass;
> +	pass = piglit_probe_pixel_depth(55, 75, 0.75) && pass;
> +
> +	/* still the clear value */
> +	pass = piglit_probe_pixel_depth(55, 95, 1.0) && pass;
> +	pass = piglit_probe_pixel_depth(55, 115, 1.0) && pass;
> +
> +
> +	/* glClipControl(GL_UPPER_LEFT, GL_ZERO_TO_ONE); */
> +
> +	/* the written depth value */
> +	pass = piglit_probe_pixel_depth(75, 15, 0.0) && pass;
> +	pass = piglit_probe_pixel_depth(75, 35, 0.25) && pass;
> +	pass = piglit_probe_pixel_depth(75, 55, 0.5) && pass;
> +	pass = piglit_probe_pixel_depth(75, 75, 0.75) && pass;
> +
> +	/* still the clear value */
> +	pass = piglit_probe_pixel_depth(75, 95, 1.0) && pass;
> +	pass = piglit_probe_pixel_depth(75, 115, 1.0) && pass;

How about putting the probing closer to the drawing?  As it is now, if a 
probe fails, where do you begin debugging?


> +
> +	piglit_present_results();
> +
> +	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
> +}
> -- 1.9.3
>
>
>
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