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/*
* Copyright © 2014 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 transform-feedback-vertex-id.c
*
* This test verifies that we get expected values of 'gl_VertexID' captured
* using transform feedback.
*
* Test creates a vertex shader which captures the value of 'gl_VertexID'
* in an output variable. Then it verifies that data captured by transform
* feedback is as expected.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 32;
config.supports_gl_core_version = 32;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static const char *vstext =
"#version 150\n"
"in vec4 vertex;\n"
"out int vertex_id;\n"
"void main()\n"
"{\n"
" gl_Position = vertex;\n"
" vertex_id = gl_VertexID;\n"
"}\n";
static const char *fstext =
"#version 150\n"
"out vec4 color;"
"void main()\n"
"{\n"
" color = vec4(1.0);\n"
"}\n";
static const GLfloat vertices[] = {
-0.6f, -0.2f, 0.0f, 1.0f,
-0.6f, 0.2f, 0.0f, 1.0f,
-0.4f, -0.4f, 0.0f, 1.0f,
-0.4f, 0.4f, 0.0f, 1.0f,
0.0f, -0.6f, 0.0f, 1.0f,
0.0f, 0.6f, 0.0f, 1.0f,
0.4f, -0.4f, 0.0f, 1.0f,
0.4f, 0.4f, 0.0f, 1.0f,
0.6f, -0.2f, 0.0f, 1.0f,
0.6f, 0.2f, 0.0f, 1.0f,
0.0f, 0.0f, 0.0f, 1.0f};
static const GLuint indices_0[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
static const GLuint indices_1[] = {2, 3, 4, 1, 5, 8, 0, 9, 6, 10, 7};
/**
* When below set of varyings are captured from the vertex shader
* above, the output should be a sequence of integers defined in this
* array.
*/
static const int expected_0[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
static const int expected_1[] = {2, 3, 4, 1, 5, 8, 0, 9, 6, 10, 7};
static const int expected_2[] = {4, 5, 6, 7};
static const char *varyings[] = {"vertex_id"};
bool
setup_xfb_and_compare(const GLuint* indices, int first,
int count, const int *expected) {
int i, num_output_ints;
GLuint xfb_buf, indexBuffer;
const GLint *readback;
bool result = true;
num_output_ints = count;
/* Gen indices array buffer if required */
glGenBuffers(1, &indexBuffer);
if (indices != NULL) {
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, count * sizeof(GLuint),
indices, GL_STATIC_DRAW);
} else {
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
/* Setup transform feedback buffers */
glGenBuffers(1, &xfb_buf);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
num_output_ints * sizeof(GLint), NULL,
GL_STATIC_READ);
printf("%s with Starting index = %d, Number of indices = %d\n",
indices ? "glDrawElements()" : "glDrawArrays()", first, count);
/* Do drawing */
glBeginTransformFeedback(GL_POINTS);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPointSize(5.0);
if (indices != NULL) {
glDrawElements(GL_POINTS, count, GL_UNSIGNED_INT, NULL);
} else {
glDrawArrays(GL_POINTS, first, count);
}
glEndTransformFeedback();
piglit_present_results();
/* Check if the correct data was written into the transform feedback
* buffers.
*/
glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf, 0,
num_output_ints * sizeof(GLint));
readback = glMapBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0,
num_output_ints * sizeof(GLint),
GL_MAP_READ_BIT);
result = piglit_check_gl_error(GL_NO_ERROR) && result;
for (i = 0; i < num_output_ints; i++) {
if (readback[i] != expected[i]) {
printf("Incorrect data for '%s' output %d."
" Expected %d, got %d.\n", varyings[0],
i, expected[i], readback[i]);
result = false;
}
}
glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
glDeleteBuffers(1, &xfb_buf);
return result;
}
void
piglit_init(int argc, char **argv)
{
int vertex_pos;
GLuint vao, vertexBuffer;
GLuint prog = piglit_build_simple_program_unlinked_multiple_shaders(
GL_VERTEX_SHADER, vstext,
GL_FRAGMENT_SHADER, fstext,
0, NULL);
glTransformFeedbackVaryings(prog, 1, varyings, GL_SEPARATE_ATTRIBS);
glLinkProgram(prog);
if (!piglit_link_check_status(prog)) {
glDeleteProgram(prog);
piglit_report_result(PIGLIT_FAIL);
}
glUseProgram(prog);
/* Gen VAO */
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
/* Gen vertex array buffer */
glGenBuffers(1, &vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, ARRAY_SIZE(vertices) * sizeof(GLfloat),
&vertices, GL_STATIC_DRAW);
/* Enable vertexAttribPointer */
vertex_pos = glGetAttribLocation(prog, "vertex");
glEnableVertexAttribArray(vertex_pos);
glVertexAttribPointer(vertex_pos, 4, GL_FLOAT, GL_FALSE, 0, 0);
}
enum piglit_result
piglit_display(void)
{
bool pass = true;
int first = 0;
int count = ARRAY_SIZE(vertices) / 4;
/* Draw with different 'first' and 'count' values, capture the
* transform feedback data and compare with expected values.
*/
pass = setup_xfb_and_compare(NULL, first,
count,
expected_0) && pass;
pass = setup_xfb_and_compare(NULL, 4 /*first*/,
4 /*count*/,
expected_2) && pass;
pass = setup_xfb_and_compare(indices_0, first,
count,
expected_0) && pass;
pass = setup_xfb_and_compare(indices_1, first,
count,
expected_1) && pass;
return (pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
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