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/*
* Copyright © 2012 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 tf-no-position.c
*
* Verify that we can render without specifying a gl_Position, by
* using EXT_transform_feedback to get results.
*/
#include "piglit-util-gl-common.h"
#define BUFFER_SIZE 4
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 10;
config.window_height = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA;
PIGLIT_GL_TEST_CONFIG_END
static const char *vs_source =
"#version 140\n"
"in uint i;\n"
"flat out uint o;\n"
"\n"
"void main()\n"
"{\n"
" o = i;\n"
"}\n";
enum piglit_result piglit_display(void)
{
return PIGLIT_FAIL; /* UNREACHED */
}
void piglit_init(int argc, char **argv)
{
GLuint vs;
GLuint *readback;
GLuint buffer[BUFFER_SIZE];
GLuint expected[BUFFER_SIZE];
int i;
bool pass = true;
GLint input_index;
GLuint prog;
GLuint xfb_buf;
GLuint verts[4] = { 0, 1, 2, 3 };
const char *varying = "o";
piglit_require_GLSL_version(140);
piglit_require_gl_version(30);
piglit_require_transform_feedback();
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
if (!vs)
piglit_report_result(PIGLIT_FAIL);
prog = piglit_CreateProgram();
piglit_AttachShader(prog, vs);
glTransformFeedbackVaryings(prog, 1, &varying, GL_INTERLEAVED_ATTRIBS);
piglit_LinkProgram(prog);
if (!piglit_link_check_status(prog))
piglit_report_result(PIGLIT_FAIL);
glGenBuffers(1, &xfb_buf);
if (!piglit_check_gl_error(0))
piglit_report_result(PIGLIT_FAIL);
input_index = glGetAttribLocation(prog, "i");
piglit_UseProgram(prog);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glVertexAttribIPointer(input_index, 1, GL_UNSIGNED_INT,
sizeof(GLuint), &verts);
glEnableVertexAttribArray(input_index);
pass = piglit_check_gl_error(0) && pass;
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, xfb_buf);
memset(buffer, 0xd0, sizeof(buffer));
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER, sizeof(buffer), buffer,
GL_STREAM_READ);
glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf,
0,
sizeof(buffer));
glBeginTransformFeedback(GL_POINTS);
glDrawArrays(GL_POINTS, 0, ARRAY_SIZE(verts));
glEndTransformFeedback();
readback = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, GL_READ_ONLY);
/* Check output */
for (i = 0; i < BUFFER_SIZE; ++i) {
if (verts[i] != readback[i]) {
printf("readback[%u]: %u, expected: %u\n", i,
readback[i], expected[i]);
pass = false;
}
}
/* Note that rasterization occurred, but the results were
* undefined due to gl_Position not being written. We do want
* to have rasterization occur (as opposed to just transform
* feedback) just to make sure the GPU didn't wedge or
* anything.
*/
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
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