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/*
* Copyright (c) 2016 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 gs-stream-location-aliasing.c
*
* Tests two vertex streams produced by a geometry shader, with location
* aliasing between the outputs of the different streams.
*
* Loosely based on transform_feedback_layout_qualifiers.c
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 32;
config.supports_gl_core_version = 32;
PIGLIT_GL_TEST_CONFIG_END
static const char vs_text[] =
"#version 150\n"
"out int vertexid;\n"
"void main() {\n"
" vertexid = gl_VertexID;\n"
"}\n";
static const char gs_text[] =
"#version 150\n"
"#extension GL_ARB_gpu_shader5: require\n"
"#extension GL_ARB_separate_shader_objects: require\n"
"#extension GL_ARB_enhanced_layouts: require\n"
"\n"
"layout(points, invocations = 2) in;\n"
"layout(points, max_vertices = 2) out;\n"
"\n"
"in int vertexid[];\n"
"\n"
"layout(xfb_offset = 0, xfb_buffer = 0, location = 0, component = 0, stream = 0) out float x1_out;\n"
"layout(xfb_offset = 0, xfb_buffer = 1, location = 0, component = 1, stream = 1) out float x2_out;\n"
"\n"
"void main() {\n"
" x1_out = 100 + 10 * vertexid[0] + gl_InvocationID;\n"
" EmitStreamVertex(0);\n"
" EndStreamPrimitive(0);\n"
" x2_out = 200 + 10 * vertexid[0] + gl_InvocationID;\n"
" EmitStreamVertex(1);\n"
" EndStreamPrimitive(1);\n"
"}";
static const int num_in_vertices = 2;
static const int num_xfb_results_per_stream = 2 * 2;
static void
build_and_use_program()
{
GLuint prog;
prog = piglit_build_simple_program_multiple_shaders(
GL_VERTEX_SHADER, vs_text,
GL_GEOMETRY_SHADER, gs_text, 0);
glLinkProgram(prog);
if (!piglit_link_check_status(prog))
piglit_report_result(PIGLIT_FAIL);
if (!piglit_check_gl_error(GL_NO_ERROR))
piglit_report_result(PIGLIT_FAIL);
glUseProgram(prog);
}
static bool
probe_buffers(const GLuint *xfb)
{
bool pass = true;
float *first;
float *second;
first = malloc(num_xfb_results_per_stream * sizeof(float));
second = malloc(num_xfb_results_per_stream * sizeof(float));
unsigned i = 0;
for (unsigned vertex = 0; vertex < 2; ++vertex) {
for (unsigned invocation = 0; invocation < 2; ++invocation) {
first[i] = 100 + 10 * vertex + invocation;
second[i] = 200 + 10 * vertex + invocation;
i++;
}
}
assert(i == num_xfb_results_per_stream);
pass = piglit_probe_buffer(xfb[0], GL_TRANSFORM_FEEDBACK_BUFFER,
"first", 1, num_xfb_results_per_stream, first) && pass;
pass = piglit_probe_buffer(xfb[1], GL_TRANSFORM_FEEDBACK_BUFFER,
"second", 1, num_xfb_results_per_stream, second) &&
pass;
free(first);
free(second);
return pass;
}
void
piglit_init(int argc, char **argv)
{
bool pass = true;
GLuint xfb[2];
GLuint vao;
piglit_require_GLSL_version(150);
piglit_require_extension("GL_ARB_transform_feedback3");
piglit_require_extension("GL_ARB_enhanced_layouts");
build_and_use_program();
glEnable(GL_RASTERIZER_DISCARD);
/* Set up the transform feedback buffers. */
glGenBuffers(2, xfb);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb[0]);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
num_xfb_results_per_stream * 4, NULL, GL_STREAM_READ);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 1, xfb[1]);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
num_xfb_results_per_stream * 4, NULL, GL_STREAM_READ);
/* Test is run under desktop OpenGL 3.2 -> use of VAOs is required */
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
/* Draw and record */
glBeginTransformFeedback(GL_POINTS);
glDrawArrays(GL_POINTS, 0, num_in_vertices);
glEndTransformFeedback();
glDeleteVertexArrays(1, &vao);
if (!piglit_check_gl_error(GL_NO_ERROR))
piglit_report_result(PIGLIT_FAIL);
pass = probe_buffers(xfb);
glDeleteBuffers(2, xfb);
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
enum piglit_result
piglit_display(void)
{
/* Should never be reached */
return PIGLIT_FAIL;
}
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