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/*
* Copyright 2014 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.
*/
/**
* Test GLSL gl_FragDepth output.
* We draw overlapping red and green quads. The red quad is at Z=0
* while the green quad's fragment depths vary from left to right.
* Should see intersecting quads.
*
* Brian Paul
* 5 August 2014
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 20;
config.window_visual = (PIGLIT_GL_VISUAL_RGBA |
PIGLIT_GL_VISUAL_DEPTH |
PIGLIT_GL_VISUAL_DOUBLE);
PIGLIT_GL_TEST_CONFIG_END
static const char *vs_text =
"varying float z; \n"
"void main() {\n"
" gl_FrontColor = gl_Color; \n"
" gl_Position = gl_Vertex;\n"
" // convert Z from [-1, 1] to [0, 1] \n"
" z = gl_Vertex.x * 0.5 + 0.5; \n"
"}\n";
static const char *fs_text =
"varying float z; \n"
"void main() { \n"
" gl_FragDepth = z; \n"
" gl_FragColor = gl_Color; \n"
"}\n";
static GLuint program;
enum piglit_result
piglit_display(void)
{
static const float red[3] = {1.0, 0.0, 0.0};
static const float green[3] = {0.0, 1.0, 0.0};
int x = piglit_width / 2;
int y = piglit_height / 2;
bool pass = true;
glViewport(0, 0, piglit_width, piglit_height);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* Draw a red quad at z = 0 (will be 0.5 in depth range [0,1]) */
glUseProgram(0);
glColor3f(1, 0, 0);
glBegin(GL_TRIANGLE_FAN);
glVertex2f(-0.5, -0.5);
glVertex2f( 0.5, -0.5);
glVertex2f( 0.5, 0.5);
glVertex2f(-0.5, 0.5);
glEnd();
/* Draw green quad w/ fragment shader which writes gl_FragDepth*/
glUseProgram(program);
glColor3f(0, 1, 0);
glBegin(GL_TRIANGLE_FAN);
glVertex2f(-0.75, -0.25);
glVertex2f( 0.75, -0.25);
glVertex2f( 0.75, 0.25);
glVertex2f(-0.75, 0.25);
glEnd();
pass = piglit_probe_pixel_rgb(x-10, y, green) && pass;
pass = piglit_probe_pixel_rgb(x+10, y, red) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
piglit_require_GLSL();
program = piglit_build_simple_program(vs_text, fs_text);
glClearColor(0.25f, 0.25f, 0.25f, 1.0f);
glEnable(GL_DEPTH_TEST);
}
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