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/*
* Copyright © 2011 Intel Corporation
* Copyright © 2014 Advanced Micro Devices, 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 immediate-reuse-index-buffer.c
*
* Verify that if a transform feedback output buffer is immediately re-used
* as an index buffer (changing no GL settings except for buffer bindings),
* rendering is correct.
*
* The test operates by using an index buffer <-> transform feedback loop
* that increments the vertex index (gl_VertexID). The test starts
* with index 0 and transform feedback writes (gl_VertexID+1). Then it uses
* the output as an input again and the index (gl_VertexID) should be 1.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 256;
config.window_height = 16;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
static const char *vstext =
"#version 130\n"
"varying vec4 out_color;\n"
"varying int index;\n"
"\n"
"void main()\n"
"{\n"
" int x = 8 + 16 * gl_VertexID;\n"
" gl_Position = vec4(x / 128.0 - 1.0, 0, 0, 1);\n"
" out_color = vec4(float(gl_VertexID) / 16.0, \n"
" float(16 - gl_VertexID) / 16.0, \n"
" float(gl_VertexID) / 16.0, 1.0);\n"
" index = gl_VertexID + 1;\n"
"}\n";
static const char *fstext =
"#version 130\n"
"varying vec4 out_color;\n"
"\n"
"void main()\n"
"{\n"
" gl_FragColor = out_color;\n"
"}\n";
static const char *varyings[] = { "index" };
static GLuint bufs[2];
static GLuint prog;
void
piglit_init(int argc, char **argv)
{
piglit_require_gl_version(30);
prog = piglit_build_simple_program_unlinked(vstext, fstext);
glTransformFeedbackVaryings(prog, 1, varyings, GL_INTERLEAVED_ATTRIBS);
glLinkProgram(prog);
if (!piglit_link_check_status(prog)) {
glDeleteProgram(prog);
piglit_report_result(PIGLIT_FAIL);
}
glGenBuffers(2, bufs);
}
enum piglit_result
piglit_display(void)
{
int i;
bool pass = true;
unsigned zero = 0;
/* Setup program and initial buffer contents */
glBindBuffer(GL_ARRAY_BUFFER, bufs[0]);
glBufferData(GL_ARRAY_BUFFER, 4, &zero, GL_STREAM_COPY);
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, bufs[1]);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER, 4, &zero, GL_STREAM_COPY);
glUseProgram(prog);
glClear(GL_COLOR_BUFFER_BIT);
glPointSize(16);
/* Draw 16 times, swapping transform feedback and index data
* so that transform feedback output is fed back to index
* input.
*/
for (i = 0; i < 16; ++i) {
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufs[i % 2]);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0,
bufs[(i + 1) % 2]);
glBeginTransformFeedback(GL_POINTS);
glDrawElements(GL_POINTS, 1, GL_UNSIGNED_INT, NULL);
glEndTransformFeedback();
}
/* Check that the proper gradient was drawn */
for (i = 0; i < 16; ++i) {
float expected_color[3] = {i/16.0, (16 - i)/16.0, i/16.0 };
pass = piglit_probe_rect_rgb(16 * i, 0, 16, 16,
expected_color) && pass;
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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