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/*
* Copyright © 2009 Intel Corporation
* Copyright © 2011 VMware, Inc.
*
* 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:
* Eric Anholt <eric@anholt.net>
* Brian Paul
*
*/
/** @file glsl-fs-fragcoord-zw-ortho.c
*
* Tests that gl_FragCoord.zw produces the expected output in a fragment shader
* with an orthographic projection
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 256;
config.window_height = 256;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH;
PIGLIT_GL_TEST_CONFIG_END
static void
draw_quad(float x, float y, float w, float h)
{
float zLeft = -1.0, zRight = 1.0;
float verts[4][4];
verts[0][0] = x;
verts[0][1] = y;
verts[0][2] = zLeft;
verts[0][3] = 1.0;
verts[1][0] = x + w;
verts[1][1] = y;
verts[1][2] = zRight;
verts[1][3] = 1.0;
verts[2][0] = x + w;
verts[2][1] = y + h;
verts[2][2] = zRight;
verts[2][3] = 1.0;
verts[3][0] = x;
verts[3][1] = y + h;
verts[3][2] = zLeft;
verts[3][3] = 1.0;
glVertexPointer(4, GL_FLOAT, 0, verts);
glEnableClientState(GL_VERTEX_ARRAY);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glDisableClientState(GL_VERTEX_ARRAY);
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int x, y;
glClearColor(0.5, 0.5, 0.5, 0.5);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
draw_quad(0, 0, piglit_width, piglit_height);
/* Test Z values */
pass = piglit_probe_pixel_depth(0, 0, 1.0) && pass;
pass = piglit_probe_pixel_depth(piglit_width-1, 0, 0.0) && pass;
pass = piglit_probe_pixel_depth(piglit_width-1, piglit_height-1, 0.0) && pass;
pass = piglit_probe_pixel_depth(0, piglit_height-1, 1.0) && pass;
/* Test colors */
for (y = 8; y < piglit_height && pass; y += 16) {
for (x = 8; x < piglit_width; x += 16) {
float color[3];
color[0] = 1.0 - x / 256.0; /* gl_FragCoord.z */
color[1] = 1.0; /* gl_FragCoord.w */
color[2] = 0;
pass &= piglit_probe_pixel_rgb(x, y, color);
if (!pass)
break;
}
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
GLint vs, fs, prog;
piglit_require_gl_version(20);
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
vs = piglit_compile_shader(GL_VERTEX_SHADER,
"shaders/glsl-mvp.vert");
fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
"shaders/glsl-fs-fragcoord-zw.frag");
prog = piglit_link_simple_program(vs, fs);
glUseProgram(prog);
glEnable(GL_DEPTH_TEST);
}
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