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/*
* Copyright © 2011 Dave Airlie
*
* 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 fs-texelFetchOffset-2D.c
*
* Tests the built-in function texelFetch() in the fragment shader.
*
* Creates a mipmapped 64x32 2D texture and draws a series of squares whose
* color contains a texel fetched from each quadrant of the rgbw texture.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 90;
config.window_height = 150;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
const int tex_size = 64;
static int pos_location, lod_location;
static const char vert[] =
"#version 130\n"
"void main()\n"
"{\n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
"}\n";
static const char frag[] =
"#version 130\n"
"uniform ivec2 pos;\n"
"uniform int lod;\n"
"uniform sampler2D tex;\n"
"void main()\n"
"{\n"
" const ivec2 offset = ivec2(-2, 2);\n"
" vec4 texel = texelFetchOffset(tex, pos, lod, offset);\n"
" gl_FragColor = texel;\n"
"}\n";
#ifdef _MSC_VER
#undef max
#endif
static float max(float x, float y) { return (x > y) ? x : y; }
enum piglit_result
piglit_display(void)
{
int l, q;
bool pass = true;
float red[4] = {1.0, 0.0, 0.0, 1.0};
float blue[4] = {0.0, 0.0, 1.0, 1.0};
float undefined[4] = {0.0, 0.0, 0.0, 0.0};
glClearColor(0.5, 0.5, 0.5, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
for (l = 0; (tex_size >> l) > 0; l++) {
const int width = tex_size >> l;
const int height = max(width / 2, 1);
const int y = 10 + 20 * l;
glUniform1i(lod_location, l);
/* Draw 4 squares with a color sample for each quad */
for (q = 0; q < 4; q++) {
const int tex_x = (q / 2) * ((width / 2));
const int tex_y = (q % 2) * ((height / 2));
float *c = undefined;
const int x = 10+20*q;
/* fancy stuff - we should see some red and blue
* due to the offset for 3 levels, all the rest is
* undefined due to out-of-bounds.
* Only with ARB_robust_buffer_access_behavior
* (and a robust context) the undefined result would
* be guaranteed to be zero instead.
*
* From the GL 3.0 spec, page 105 ("Texel Fetches"):
*
* "The results of the texel fetch are
* undefined if any of the following
* conditions hold:
*
* ...
*
* - The texel coordinates refer to a
* border texel outside of the defined
* extents of the specified LOD"
*/
if (l < 3) {
if (q == 2) c = red;
else if (q == 3) c = blue;
} else if (l == 3)
if (q == 2) c = blue;
glUniform2i(pos_location, tex_x, tex_y);
piglit_draw_rect(x, y, 10, 10);
if (width > 2 && c != undefined) /* below 1 wide no test */
pass &= piglit_probe_rect_rgba(x, y, 10, 10, c);
}
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
int vs, fs, prog;
int tex_location;
piglit_require_GLSL_version(130);
glActiveTexture(GL_TEXTURE0);
piglit_rgbw_texture(GL_RGBA, tex_size, tex_size / 2, true, false,
GL_UNSIGNED_NORMALIZED);
piglit_ortho_projection(piglit_width, piglit_height, false);
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
prog = piglit_link_simple_program(vs, fs);
tex_location = glGetUniformLocation(prog, "tex");
lod_location = glGetUniformLocation(prog, "lod");
pos_location = glGetUniformLocation(prog, "pos");
glUseProgram(prog);
glUniform1i(tex_location, 0);
}
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