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/*
* 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.
*
* Authors:
* Julian Adams <joolsa@gmail.com>
*/
/**
* @file fragment-and-vertex-texturing.c
*
* Tests that sampling from both vertex and fragment textures each read
* from the correct texture.
*/
#include <string.h>
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 128;
config.window_height = 128;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static const char *vs_source =
"uniform sampler2D vertex_tex; \n"
"varying vec3 vertex_tex_color; \n"
/* "uniform sampler2D fragment_tex; \n"
"varying vec3 fragment_tex_color; \n" */
"void main() \n"
"{ \n"
" gl_Position = gl_Vertex;\n"
" vertex_tex_color = texture2DLod(vertex_tex, vec2(0.5), 0.0).xyz; \n"
/* " fragment_tex_color = texture2DLod(fragment_tex, vec2(0.5), 0.0).xyz; \n" */
"} \n";
static const char *fs_source =
"uniform sampler2D fragment_tex; \n"
"varying vec3 vertex_tex_color; \n"
"void main() \n"
"{ \n"
" vec3 fragment_tex_color = texture2D(fragment_tex, vec2(0.5), 0.0).xyz; \n"
" gl_FragColor = vec4(fragment_tex_color + vertex_tex_color, 1.0); \n"
"} \n";
static const char *prog = "fragment-and-vertex-texturing";
/* debug aid */
static void
check_error(int line)
{
GLenum err = glGetError();
if (err) {
printf("%s: GL error 0x%x at line %d\n", prog, err, line);
}
}
/* debug aid */
static void
check_bad_location(GLint location, int line)
{
if (location == -1) {
printf("%s: bad GL location at line %d\n", prog, line);
}
}
static GLuint
make_texture(int texture_unit, unsigned char r, unsigned char g, unsigned char b)
{
#define texSize 8
GLuint tex;
unsigned char texImage[texSize * texSize * 4];
GLuint i, j;
for (i = 0; i < texSize; i++) {
for (j = 0; j < texSize; j++) {
int k = (i * texSize + j) * 3;
texImage[k] = r;
texImage[k + 1] = g;
texImage[k + 2] = b;
}
}
glGenTextures(1, &tex);
glActiveTexture(GL_TEXTURE0 + texture_unit);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, texSize, texSize, 0,
GL_RGB, GL_UNSIGNED_BYTE, texImage);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
check_error(__LINE__);
return tex;
}
static void
display(void)
{
const int vertex_tex_unit = 0;
const int fragment_tex_unit = 1;
GLuint fs, vs, prog;
GLuint red, green;
GLint vertex_tex_loc, fragment_tex_loc;
/* Clear all to blue so we see if the shader rendering happens. */
glClearColor(0.0, 0.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
/* Build the shader that spams green to all outputs. */
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);
glUseProgram(prog);
check_error(__LINE__);
red = make_texture(vertex_tex_unit, 127, 0, 0);
green = make_texture(fragment_tex_unit, 0, 127, 0);
// -1 is bad
vertex_tex_loc = glGetUniformLocation(prog, "vertex_tex");
check_bad_location(vertex_tex_loc, __LINE__);
fragment_tex_loc = glGetUniformLocation(prog, "fragment_tex");
check_bad_location(fragment_tex_loc, __LINE__);
glUniform1i(vertex_tex_loc, vertex_tex_unit);
glUniform1i(fragment_tex_loc, fragment_tex_unit);
piglit_draw_rect(-1, -1, 2, 2);
check_error(__LINE__);
glDeleteTextures(1, &red);
glDeleteTextures(1, &green);
check_error(__LINE__);
}
enum piglit_result
piglit_display(void)
{
static const float expected[] = {0.5, 0.5, 0.0};
int pass;
display();
pass = piglit_probe_pixel_rgb(1, 1, expected);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
int m;
printf("The result should be a solid block of half-bright yellow color\n");
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
piglit_require_gl_version(20);
glGetIntegerv(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB, &m);
if (m < 1) {
printf("No vertex shader texture units supported.\n");
piglit_report_result(PIGLIT_SKIP);
}
}
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