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/*
* Copyright (c) 2012 VMware, Inc.
*
* 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 sampler-incomplete.c
*
* With GL_ARB_sampler_objects it's possible for a texture to be both complete
* and incomplete depending on the samplers used to access it.
* Test that we get the right results in this situation.
*
* Brian Paul
* March 2012
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 100;
config.window_height = 100;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
PIGLIT_GL_TEST_CONFIG_END
static void
setup(void)
{
static const GLfloat red[2][2][4] = {
{ {0.25, 0, 0, 0}, {0.25, 0, 0, 0} },
{ {0.25, 0, 0, 0}, {0.25, 0, 0, 0} } };
static const char *fragShaderText =
"uniform sampler2D tex0, tex1;\n"
"void main()\n"
"{\n"
" vec2 coord = vec2(0.5, 0.5); \n"
" gl_FragColor = texture2D(tex0, coord) \n"
" + texture2D(tex1, coord);\n"
"}\n";
GLuint samplers[2];
GLuint frag, prog;
GLint u;
GLuint tex;
/* Create fragment shader that adds the two textures */
frag = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragShaderText);
prog = piglit_link_simple_program(0, frag);
glUseProgram(prog);
u = glGetUniformLocation(prog, "tex0");
glUniform1i(u, 0);
u = glGetUniformLocation(prog, "tex1");
glUniform1i(u, 1);
/* create texture with one mipmap level */
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0,
GL_RGBA, GL_FLOAT, red);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
/* bind the texture to units 0 and 1 */
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, tex);
glEnable(GL_TEXTURE_2D);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, tex);
glEnable(GL_TEXTURE_2D);
glGenSamplers(2, samplers);
/* sampler[0] - nearest filtering, no mipmap.
* The result of sampling the texture should be (0.25, 0, 0, 0)
*/
glBindSampler(0, samplers[0]);
glSamplerParameteri(samplers[0], GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glSamplerParameteri(samplers[0], GL_TEXTURE_MAG_FILTER, GL_NEAREST);
/* sampler[1] - nearest filtering, with mipmapping.
* The result of sampling the texture should be (0, 0, 0, 1) since the
* texture is incomplete with respect to this sampler (no mipmap).
*/
glBindSampler(1, samplers[1]);
glSamplerParameteri(samplers[1], GL_TEXTURE_MIN_FILTER,
GL_NEAREST_MIPMAP_NEAREST);
glSamplerParameteri(samplers[1], GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
enum piglit_result
piglit_display(void)
{
/* NOTE: We're not checking the alpha value here.
* Some drivers (like NVIDIA) seem to return (0,0,0,0) when sampling
* an incomplete texture, but the spec says (0,0,0,1) should be
* returned. That's not really important for this test though so
* just ignore alpha.
*/
GLfloat expected[3] = {0.25, 0, 0};
bool p;
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect_tex(-1, -1, 2, 2, 0, 0, 1, 1);
p = piglit_probe_pixel_rgb(piglit_width / 2, piglit_height / 2,
expected);
piglit_present_results();
return p ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char**argv)
{
piglit_require_GLSL();
piglit_require_extension("GL_ARB_sampler_objects");
setup();
}
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