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/*
* Copyright (c) The Piglit project 2008
*
* 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS 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.
*/
/**
* @file
* Test basic line stippling functionality.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
128 /*window_width*/,
128 /*window_height*/,
GLUT_RGB | GLUT_DOUBLE)
static void probe_pixel(int x, int y, const float* expected)
{
if (!piglit_probe_pixel_rgb(x, y, expected)) {
if (piglit_automatic)
piglit_report_result(PIGLIT_FAIL);
}
}
struct vertex {
GLuint x;
GLuint y;
};
struct stipple_line {
const char *name;
GLint factor;
GLuint pattern;
GLfloat color[3];
GLuint primitive;
GLuint nvertices;
struct vertex *vertices;
};
static const int basex = 10;
static const int basey = 10;
static float background[3] = { 0, 0, 0 };
/**
* @note Only horizontal and vertical lines supported right now.
*/
static GLuint probe_line(const struct stipple_line *line, const struct vertex *v1, const struct vertex *v2, GLuint fragment)
{
int x = v1->x;
int y = v1->y;
int length, dx = 0, dy = 0;
if (v2->x != v1->x) {
if (v2->x > v1->x)
dx = 1;
else
dx = -1;
length = (v2->x - v1->x)*dx;
} else {
if (v2->y > v1->y)
dy = 1;
else
dy = -1;
length = (v2->y - v1->y)*dy;
}
while(length) {
GLuint s = (fragment/line->factor) & 15;
if (line->pattern & (1 << s))
probe_pixel(basex+x, basey+y, line->color);
else
probe_pixel(basex+x, basey+y, background);
length--;
fragment++;
x += dx;
y += dy;
}
return fragment;
}
static void test_line(const struct stipple_line *line)
{
GLuint i;
glLineStipple(line->factor, line->pattern);
glColor3f(line->color[0], line->color[1], line->color[2]);
glBegin(line->primitive);
for(i = 0; i < line->nvertices; ++i)
glVertex2f(line->vertices[i].x + 0.5, line->vertices[i].y + 0.5);
glEnd();
glReadBuffer(GL_BACK);
if (line->primitive == GL_LINES) {
for(i = 0; i+1 < line->nvertices; i += 2)
probe_line(line, &line->vertices[i], &line->vertices[i+1], 0);
} else {
GLuint fragment = 0;
for(i = 0; i+1 < line->nvertices; ++i)
fragment = probe_line(line, &line->vertices[i], &line->vertices[i+1], fragment);
if (line->primitive == GL_LINE_LOOP)
probe_line(line, &line->vertices[i], &line->vertices[0], fragment);
}
}
static struct vertex BaselineVertices[] = { { 0, 0 }, { 24, 0 } };
static struct vertex RestartVertices[] = { { 0, 2 }, { 24, 2 }, { 0, 4 }, { 24, 4 } };
static struct vertex LinestripVertices[] = { { 0, 6 }, { 24, 6 }, { 24, 30 } };
static struct vertex LineloopVertices[] = { { 26, 0 }, { 46, 0 }, { 46, 20 }, { 26, 20 } };
static struct vertex Factor2Vertices[] = { { 0, 32 }, { 32, 32 }, { 32, 33 }, { 0, 33 } };
static struct vertex Factor3Vertices[] = { { 0, 35 }, { 63, 35 }, { 63, 36 }, { 0, 36 } };
static struct stipple_line Lines[] = {
{ /* Baseline */
"Baseline",
1, 0xffff, { 1.0, 1.0, 1.0 },
GL_LINES, 2,
BaselineVertices
},
{ /* Restarting lines within a single Begin/End block */
"Restarting lines within a single Begin/End block",
1, 0x00ff, { 1.0, 0.0, 0.0 },
GL_LINES, 4,
RestartVertices
},
{ /* Line strip */
"Line strip",
1, 0x0f8f, { 1.0, 1.0, 0.0 },
GL_LINE_STRIP, 3,
LinestripVertices
},
{ /* Line loop */
"Line loop",
1, 0x8cef, { 0.0, 1.0, 0.0 },
GL_LINE_LOOP, 4,
LineloopVertices
},
{ /* Factor 2x */
"Factor 2x",
2, 0x838f, { 0.0, 0.0, 1.0 },
GL_LINE_LOOP, 4,
Factor2Vertices
},
{ /* Factor 3x */
"Factor 3x",
3, 0xf731, { 0.0, 1.0, 1.0 },
GL_LINE_LOOP, 4,
Factor3Vertices
}
};
static void test(void)
{
int i;
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_LINE_STIPPLE);
glPushMatrix();
glTranslatef(basex, basey, 0.0);
for(i = 0; i < sizeof(Lines)/sizeof(Lines[0]); ++i) {
puts(Lines[i].name);
test_line(&Lines[i]);
}
glPopMatrix();
piglit_present_results();
}
enum piglit_result
piglit_display(void)
{
test();
return PIGLIT_PASS;
}
static void Reshape(int width, int height)
{
piglit_width = width;
piglit_height = height;
glViewport(0, 0, width, height);
piglit_ortho_projection(width, height, GL_FALSE);
}
void piglit_init(int argc, char **argv)
{
glutReshapeFunc(Reshape);
Reshape(piglit_width, piglit_height);
}
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