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/*
* Copyright © 2011 Intel Corporation
*
* 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.
*/
/** @file vertex-program-two-side.c
*
* Tests two-sided lighting behavior.
*
* From the GL 2.1 spec, page 63 (page 77 of the PDF):
*
* "Additionally, vertex shaders can operate in two-sided color
* mode. When a vertex shader is active, front and back colors
* can be computed by the vertex shader and written to the
* gl_FrontColor, gl_BackColor, gl_FrontSecondaryColor and
* gl_BackSecondaryColor outputs. If VERTEX PROGRAM TWO SIDE is
* enabled, the GL chooses between front and back colors, as
* described below. Otherwise, the front color output is always
* selected. Two-sided color mode is enabled and disabled by
* calling Enable or Disable with the symbolic value VERTEX
* PROGRAM TWO SIDE."
*
* This appears to override the text in the GLSL 1.10 spec which
* implies that two-sided behavior always occurs.
*/
#define _GNU_SOURCE
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
100 /*window_width*/,
100 /*window_height*/,
PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA | PIGLIT_GL_VISUAL_DOUBLE)
static GLint prog;
static bool enabled = false;
static bool front = false;
static bool back = false;
static bool front2 = false;
static bool back2 = false;
static float frontcolor[4] = {0.0, 0.5, 0.0, 0.0};
static float backcolor[4] = {0.0, 0.0, 0.5, 0.0};
static float secondary_frontcolor[4] = {0.0, 0.25, 0.0, 0.0};
static float secondary_backcolor[4] = {0.0, 0.0, 0.25, 0.0};
static int draw_secondary_loc;
static const char *fs_source =
"uniform bool draw_secondary;\n"
"void main()\n"
"{\n"
" if (draw_secondary)\n"
" gl_FragColor = gl_SecondaryColor;\n"
" else\n"
" gl_FragColor = gl_Color;\n"
"}\n";
enum piglit_result
piglit_display(void)
{
int x1 = 0, y1 = 0;
int w = piglit_width / 2, h = piglit_height / 2;
int x2 = piglit_width - w, y2 = piglit_height - h;
bool pass = true;
glClearColor(0.5, 0.5, 0.5, 0.5);
glClear(GL_COLOR_BUFFER_BIT);
glUniform1i(draw_secondary_loc, false);
piglit_draw_rect(-1, 0, 1, 1); /* top left */
piglit_draw_rect( 1, 0, -1, 1); /* top right */
glUniform1i(draw_secondary_loc, true);
piglit_draw_rect(-1, -1, 1, 1); /* bot left */
piglit_draw_rect( 1, -1, -1, 1); /* bot right */
if (front) {
pass = pass && piglit_probe_rect_rgba(x1, y2, w, h,
frontcolor);
}
if (front2) {
pass = pass && piglit_probe_rect_rgba(x1, y1, w, h,
secondary_frontcolor);
}
if (enabled) {
/* Two-sided: Get the back color/secondarycolor. */
if (back) {
pass = pass && piglit_probe_rect_rgba(x2, y2, w, h,
backcolor);
}
if (back2) {
pass = pass && piglit_probe_rect_rgba(x2, y1, w, h,
secondary_backcolor);
}
} else {
/* Non-two-sided: Get the front color/secondarycolor. */
if (front) {
pass = pass && piglit_probe_rect_rgba(x2, y2, w, h,
frontcolor);
}
if (front2) {
pass = pass && piglit_probe_rect_rgba(x2, y1, w, h,
secondary_frontcolor);
}
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
static void
setup_output(char **out, const char *name, float *values)
{
asprintf(out,
" %s = vec4(%f, %f, %f, %f);\n",
name,
values[0],
values[1],
values[2],
values[3]);
}
void
piglit_init(int argc, char **argv)
{
GLint vs, fs;
char *vs_outputs[4] = {"", "", "", ""};
char *vs_source;
int i;
piglit_require_GLSL();
piglit_require_gl_version(20);
printf("Window quadrants show:\n");
printf("+-------------------------+------------------------+\n");
printf("| front gl_Color | back gl_Color |\n");
printf("+-------------------------+------------------------+\n");
printf("| front gl_SecondaryColor | back gl_SecondaryColor |\n");
printf("+-------------------------+------------------------+\n");
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "enabled") == 0) {
enabled = true;
} else if (strcmp(argv[i], "front") == 0) {
front = true;
} else if (strcmp(argv[i], "back") == 0) {
back = true;
} else if (strcmp(argv[i], "front2") == 0) {
front2 = true;
} else if (strcmp(argv[i], "back2") == 0) {
back2 = true;
} else {
fprintf(stderr, "unknown argument %s\n", argv[i]);
}
}
if (front)
setup_output(&vs_outputs[0], "gl_FrontColor", frontcolor);
if (back)
setup_output(&vs_outputs[1], "gl_BackColor", backcolor);
if (front2)
setup_output(&vs_outputs[2], "gl_FrontSecondaryColor", secondary_frontcolor);
if (back2)
setup_output(&vs_outputs[3], "gl_BackSecondaryColor", secondary_backcolor);
asprintf(&vs_source,
"void main()\n"
"{\n"
" gl_Position = gl_Vertex;\n"
"%s%s%s%s"
"}\n",
vs_outputs[0],
vs_outputs[1],
vs_outputs[2],
vs_outputs[3]);
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
prog = piglit_link_simple_program(vs, fs);
if (!prog || !vs || !fs) {
printf("VS source:\n%s", vs_source);
printf("FS source:\n%s", fs_source);
piglit_report_result(PIGLIT_FAIL);
}
glUseProgram(prog);
draw_secondary_loc = glGetUniformLocation(prog, "draw_secondary");
assert(draw_secondary_loc != -1);
if (enabled)
glEnable(GL_VERTEX_PROGRAM_TWO_SIDE);
}
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