On Sunday, October 26, 2014 03:01:12 AM Ilia Mirkin wrote: > On Sat, Oct 25, 2014 at 3:45 AM, <[email protected]> wrote: > > From: Mathias Fröhlich <[email protected]> > > > > Hi, > > > > This adds clip control to the set of piglit tests. > > > > please review > > > > Mathias > > > > v2: > > Check for ARB_depth_buffer_float where used. > > Fix and extend comments. > > Introduce helper for reading and checking the clip control state. > > Split state and draw related parts into separate methods. > > Test for Push/PopAttrib. > > > > v3: > > Add tests to tests/all.py. > > > > Signed-off-by: Mathias Froehlich <[email protected]> > > CC: Ilia Mirkin <[email protected]> > > CC: Brian Paul <[email protected]> > > --- > > registry/gl.xml | 23 +- > > tests/all.py | 5 + > > 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 | 186 +++++++++++++++ > > tests/spec/arb_clip_control/clip-control.c | 263 +++++++++++++++++++++ > > 7 files changed, 493 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/all.py b/tests/all.py > > index ea83695..a629462 100644 > > --- a/tests/all.py > > +++ b/tests/all.py > > @@ -2278,6 +2278,11 @@ add_fbo_generatemipmap_extension(tdfx_texture_compression_fxt1, 'GL_3DFX_texture > > tdfx_texture_compression_fxt1['invalid formats'] = PiglitGLTest('arb_texture_compression-invalid-formats fxt1', run_concurrent=True) > > add_plain_test(tdfx_texture_compression_fxt1, 'fxt1-teximage') > > > > +arb_clip_control = {} > > +spec['ARB_clip_control'] = arb_clip_control > > +add_plain_test(arb_clip_control, 'clip-control') > > +add_plain_test(arb_clip_control, 'clip-control-depth-precision') > > + > > def add_color_buffer_float_test(name, format, p1, p2): > > arb_color_buffer_float[format + '-' + name + ('-' + p1 if len(p1) else '') + ('-' + p2 if len(p2) else '')] = PiglitGLTest(' '.join(['arb_color_buffer_float-' + name, format, p1, p2]), run_concurrent=True) > > > > diff --git a/tests/spec/CMakeLists.txt b/tests/spec/CMakeLists.txt > > index b2da115..5a347ae 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..3463ca0 > > --- /dev/null > > +++ b/tests/spec/arb_clip_control/clip-control-depth-precision.c > > @@ -0,0 +1,186 @@ > > +/* > > + * Copyright Mathias Fröhlich <[email protected]> > > + * > > + * 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 <[email protected]> > > + */ > > + > > +/** @file clip-control-depth-precision.c > > + * > > + * Test for ARB_clip_control. > > + * This is actually the application level use case making use of the > > + * close to logarithmic depth buffer precision available with the > > + * GL_ZERO_TO_ONE depth mode that is newly provided with this extension. > > + * The ARB_clip_control spec gives a set of web references explaining the > > + * background greatly. > > + * In short we set up a projection matrix that maps infinite far away > > + * points to 0 and the near plane to 1. We use a float depth buffer > > + * with a well known accuracy behavior. That together gives a depth > > + * buffer resolution that is about the relative floating point accuracy > > + * relative to the distance from the eye point. > > + * This extension avoids adding a constant number even in an intermediate > > + * step which would destroy the effective depth precision possible with > > + * the floating point depth buffers. > > + * Roughtly in numbers: > > + * Two fragments at 5000001 and 5000000 \about 5000001*(1 - eps) distance > > + * from the eye point should yield to different values in the depth buffer. > > + * The same goes for about any fragment distance x that you should be able > > + * to distinguish this from x*(1 - eps). > > + * And this is exactly what this test checks. We draw two surfaces > > + * a big red one at a distance x and a half that big green one at a distance > > + * x*(1 - 10*eps) to have a security factor of 10 to allow for some roundoff > > + * errors to accumulate. Due to the depth precision we must not get z fighting > > + * between these two and see a nested green solid square inside a bigger red > > + * square really behind it. > > + */ > > + > > +#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_ARB_depth_buffer_float"); > > + 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); > > + 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); > > + > > + 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 depth we want to test */ > > + 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; > > + } > > + > > + > > + /* set viewport to window size */ > > + glViewport(0, 0, piglit_width, piglit_height); > > + > > + /* copy the result to the back buffer */ > > + 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..b913e40 > > --- /dev/null > > +++ b/tests/spec/arb_clip_control/clip-control.c > > @@ -0,0 +1,263 @@ > > +/* > > + * Copyright Mathias Fröhlich <[email protected]> > > + * > > + * 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 <[email protected]> > > + */ > > + > > +/** @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(); > > +}
Why not use piglit_draw_rect_z() for this?
> > +
> > +GLboolean
> > +test_clip_control(GLenum origin, GLenum mode)
> > +{
> > + GLboolean pass;
> > + GLint value;
> > +
> > + pass = piglit_check_gl_error(GL_NO_ERROR);
> > +
> > + glGetIntegerv(GL_CLIP_ORIGIN, &value);
> > + if (value != origin) {
> > + fprintf(stderr, "glClipControl origin unexpected!\n");
> > + pass = GL_FALSE;
> > + }
> > + glGetIntegerv(GL_CLIP_DEPTH_MODE, &value);
> > + if (value != mode) {
> > + fprintf(stderr, "glClipControl mode unexpected!\n");
> > + pass = GL_FALSE;
> > + }
> > +
> > + return pass;
> > +}
> > +
> > +GLboolean
> > +state_test(void)
> > +{
> > + GLboolean pass = GL_TRUE;
> > +
> > + /* The initial values */
> > + pass = test_clip_control(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE) &&
pass;
> > +
> > + glClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE);
> > + pass = test_clip_control(GL_LOWER_LEFT, GL_ZERO_TO_ONE) && pass;
> > +
> > + glClipControl(GL_UPPER_LEFT, GL_ZERO_TO_ONE);
> > + pass = test_clip_control(GL_UPPER_LEFT, GL_ZERO_TO_ONE) && pass;
> > +
> > + glClipControl(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
> > + pass = test_clip_control(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE) &&
pass;
> > +
> > + /* Check bailing out on invalid input */
> > + glClipControl(GL_RGB, GL_NEGATIVE_ONE_TO_ONE);
> > + pass = piglit_check_gl_error(GL_INVALID_ENUM) && pass;
> > + piglit_reset_gl_error();
> > + pass = test_clip_control(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE) &&
pass;
> > +
> > + glClipControl(GL_LOWER_LEFT, GL_RGB);
> > + pass = piglit_check_gl_error(GL_INVALID_ENUM) && pass;
> > + piglit_reset_gl_error();
> > + pass = test_clip_control(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE) &&
pass;
> > +
> > +
> > + /* Check push/pop */
> > + glClipControl(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
> > + pass = test_clip_control(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE) &&
pass;
> > +
> > + glPushAttrib(GL_TRANSFORM_BIT);
> > +
> > + glClipControl(GL_UPPER_LEFT, GL_ZERO_TO_ONE);
> > + pass = test_clip_control(GL_UPPER_LEFT, GL_ZERO_TO_ONE) && pass;
> > +
> > + /* Back to default */
> > + glPopAttrib();
> > + pass = test_clip_control(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE) &&
pass;
> > +
> > + return pass;
> > +}
> > +
> > +GLboolean
> > +draw_test(void)
> > +{
> > + GLboolean pass = GL_TRUE;
> > +
> > + /* 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);
> > +
> > + /* The clear value - to be sure */
> > + pass = piglit_probe_pixel_depth(5, 5, 1.0) && pass;
> > +
> > +
> > +
> > + /* 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);
> > +
> > + /* 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;
>
> Shouldn't you be clearing in between each one?
It looks like each quad is drawn to a separate location (10/10, 10/30, 10/50,
10/70 above, 30/10, 30/30, 30/50, 30/70 below), so I'm not sure why you'd need
to clear.
> > +
> > +
> > +
> > + 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);
>
> Why are these z-values negative? (Same question below as well...)
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