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/*
* Copyright © 2013 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
*
* Verify that when transform feedback is applied to a program
* containing both a geometry shader and a vertex shader, the size and
* type of the data captured (as well as the data itself) are
* determined by the geometry shader and not the vertex shader.
*
* This test creates a geometry and a vertex shader which both output
* the following variables:
*
* - foo
* - gl_ClipDistance
*
* but declare them to have different types and array sizes, and
* output different data to them.
*
* Then it verifies that:
*
* - glGetTransformFeedbackVarying() returns information based on the
* types and array sizes declared in the geometry shader.
*
* - The data captured by transform feedback is consistent with the
* declarations in the geometry shader.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 32;
config.supports_gl_core_version = 32;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
/**
* This vertex shader should generate the following outputs (assuming
* that 2 vertices are processed):
*
* foo gl_ClipDistance
* [0] [1] [0] [1] [2]
* 1001 1003 1007 1008 1009
* 1011 1013 1017 1018 1019
*/
static const char *vstext =
"#version 150\n"
"out VsOuts {\n"
" float foo[2];\n"
"};\n"
"out gl_PerVertex {\n"
" float gl_ClipDistance[3];\n"
"};\n"
"void main()\n"
"{\n"
" float x = float(gl_VertexID * 10 + 1000);\n"
" foo[0] = x + 1.0;\n"
" foo[1] = x + 3.0;\n"
" gl_ClipDistance[0] = x + 7.0;\n"
" gl_ClipDistance[1] = x + 8.0;\n"
" gl_ClipDistance[2] = x + 9.0;\n"
"}\n";
/**
* When coupled with the vertex shader above, this geometry shader
* should generate the following outputs:
*
* foo gl_ClipDistance
* [0] [1] [2] [0] [1] [2] [3]
* (1, 2) (3, 4) (5, 6) 7 8 9 10
* (11, 12) (13, 14) (15, 16) 17 18 19 20
*/
static const char *gstext =
"#version 150\n"
"layout(points) in;\n"
"layout(points, max_vertices = 1) out;\n"
"in VsOuts {\n"
" float foo[2];\n"
"} vs_outs[1];\n"
"in gl_PerVertex {\n"
" float gl_ClipDistance[3];\n"
"} gl_in[];\n"
"out vec2 foo[3];\n"
"out float gl_ClipDistance[4];\n"
"void main()\n"
"{\n"
" foo[0] = vs_outs[0].foo[0] - 1000.0 + vec2(0.0, 1.0);\n"
" foo[1] = vs_outs[0].foo[1] - 1000.0 + vec2(0.0, 1.0);\n"
" foo[2] = vs_outs[0].foo[1] - 1000.0 + vec2(2.0, 3.0);\n"
" gl_ClipDistance[0] = gl_in[0].gl_ClipDistance[0] - 1000.0;\n"
" gl_ClipDistance[1] = gl_in[0].gl_ClipDistance[1] - 1000.0;\n"
" gl_ClipDistance[2] = gl_in[0].gl_ClipDistance[2] - 1000.0;\n"
" gl_ClipDistance[3] = gl_in[0].gl_ClipDistance[2] - 1000.0 + 1.0;\n"
" EmitVertex();\n"
"}\n";
/**
* When this set of varyings is captured from the geometry shader
* above, the output should be a sequence of floating point numbers
* counting from 1 to 20.
*/
static const char *varyings[] = { "foo", "gl_ClipDistance" };
#define EXPECTED_NUM_OUTPUT_FLOATS 20
static bool
check_varying(GLuint prog, GLuint index, const char *expected_name, GLsizei expected_size, GLenum expected_type)
{
GLsizei length, size;
GLenum type;
char name[100];
bool pass = true;
glGetTransformFeedbackVarying(prog, index, ARRAY_SIZE(name), &length,
&size, &type, name);
name[ARRAY_SIZE(name) - 1] = '\0';
if (strcmp(name, expected_name) != 0) {
printf("Varying %d: expected name '%s', got '%s'\n", index,
expected_name, name);
pass = false;
}
if (expected_size != size) {
printf("varying %d: expected size %d, got %d\n", index,
expected_size, size);
pass = false;
}
if (expected_type != type) {
printf("varying %d: expected type %d (%s), got %d (%s)\n",
index,
expected_type, piglit_get_gl_enum_name(expected_type),
type, piglit_get_gl_enum_name(type));
pass = false;
}
return pass;
}
void
piglit_init(int argc, char **argv)
{
GLuint prog, vao, xfb_buf;
const GLfloat *readback;
int i;
bool pass = true;
prog = piglit_build_simple_program_unlinked_multiple_shaders(
GL_VERTEX_SHADER, vstext,
GL_GEOMETRY_SHADER, gstext,
0, NULL);
glTransformFeedbackVaryings(prog, ARRAY_SIZE(varyings), varyings,
GL_INTERLEAVED_ATTRIBS);
glLinkProgram(prog);
if (!piglit_link_check_status(prog)) {
glDeleteProgram(prog);
piglit_report_result(PIGLIT_FAIL);
}
glUseProgram(prog);
/* Check that glGetTransformFeedbackVarying() returns the
* correct values.
*/
pass = check_varying(prog, 0, "foo", 3, GL_FLOAT_VEC2) && pass;
pass = check_varying(prog, 1, "gl_ClipDistance", 4, GL_FLOAT) && pass;
/* Setup GL state necessary for drawing */
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glGenBuffers(1, &xfb_buf);
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, xfb_buf);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
EXPECTED_NUM_OUTPUT_FLOATS * sizeof(GLfloat), NULL,
GL_STREAM_READ);
glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf, 0,
EXPECTED_NUM_OUTPUT_FLOATS * sizeof(GLfloat));
glEnable(GL_RASTERIZER_DISCARD);
/* Do drawing */
glBeginTransformFeedback(GL_POINTS);
glDrawArrays(GL_POINTS, 0, 2);
glEndTransformFeedback();
/* Check that the correct data was written into the transform
* feedback buffer.
*/
readback = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, GL_READ_ONLY);
for (i = 0; i < EXPECTED_NUM_OUTPUT_FLOATS; i++) {
GLfloat expected = i + 1;
if (readback[i] != expected) {
printf("Incorrect data for output %d."
" Expected %f, got %f.\n", i, expected,
readback[i]);
pass = false;
}
}
glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
/* Check for errors */
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
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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