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/*
* Copyright © 2010 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 glsl-fs-fragcoord.c
*
* Tests that gl_FragCoord produces the expected output in a fragment shader.
*/
#include "piglit-util-gl-common.h"
#define WIDTH 256
#define HEIGHT 256
PIGLIT_GL_TEST_MAIN(
WIDTH /*window_width*/,
HEIGHT /*window_height*/,
PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_ALPHA)
static GLint prog;
static int
create_fbo(unsigned width, unsigned height, GLuint *out_tex)
{
GLuint tex;
GLuint fb;
GLenum status;
GLenum internal_format = GL_RGBA;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
assert(glGetError() == 0);
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, tex, 0);
assert(glGetError() == 0);
status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
if (status == GL_FRAMEBUFFER_UNSUPPORTED_EXT)
printf("FBO with 0x%04x texture is unsupported\n",
internal_format);
else
fprintf(stderr, "FBO with 0x%04x texture is incomplete"
" (0x%04x)\n",
internal_format, status);
glDeleteFramebuffersEXT(1, &fb);
glDeleteTextures(1, &tex);
piglit_report_result((status == GL_FRAMEBUFFER_UNSUPPORTED_EXT)
? PIGLIT_SKIP : PIGLIT_FAIL);
}
*out_tex = tex;
return fb;
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int x, y;
GLuint fb, tex;
/* Draw the shader to the fbo. */
fb = create_fbo(WIDTH, HEIGHT, &tex);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
glViewport(0, 0, WIDTH, HEIGHT);
glClearColor(1.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(prog);
piglit_draw_rect(-1, -1, 2, 2);
/* Draw the FBO to the screen. */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glViewport(0, 0, piglit_width, piglit_height);
glClearColor(0.0, 0.0, 1.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D, tex);
glEnable(GL_TEXTURE_2D);
glUseProgram(0);
piglit_draw_rect_tex(-1, -1, 2, 2,
0, 0, 1, 1);
glDisable(GL_TEXTURE_2D);
glDeleteTextures(1, &tex);
glDeleteFramebuffersEXT(1, &fb);
assert(glGetError() == 0);
for (y = 0; y < piglit_height; y++) {
for (x = 0; x < piglit_width; x++) {
float color[3];
color[0] = x / 256.0;
color[1] = y / 256.0;
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;
piglit_require_gl_version(20);
vs = piglit_compile_shader(GL_VERTEX_SHADER,
"shaders/glsl-mvp.vert");
fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
"shaders/glsl-fs-fragcoord.frag");
prog = piglit_link_simple_program(vs, fs);
}
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