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/*
* Copyright © 2011 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 overflow-edge-cases.c
*
* Verify edge cases of transform feedback overflow checking.
*
* This test exercises all possible combinations of the following four
* variables:
*
* - Size passed to glBindBufferRange (1-6 floats)
* - Number of transform feedback varying components (1 or 2)
* - Number of primitives drawn (1-3)
* - Primitive mode (GL_POINTS, GL_LINES, or GL_TRIANGLES)
*
* In all cases, it verifies that:
*
* - The proper values were written to the transform feedback buffer.
* - GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN is set correctly.
* - GL_PRIMITIVES_GENERATED is set correctly.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 16;
config.window_height = 16;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
PIGLIT_GL_TEST_CONFIG_END
#define XFB_BUFFER_SIZE 12
#define MAX_VERTICES 9
static const char *vstext =
"attribute float vertex_num;\n"
"varying float varying1;\n"
"varying float varying2;\n"
"\n"
"void main()\n"
"{\n"
" gl_Position = vec4(vertex_num);\n"
" varying1 = 100.0 + vertex_num;\n"
" varying2 = 200.0 + vertex_num;\n"
"}\n";
static const char *varyings[] = { "varying1", "varying2" };
static GLuint xfb_buf;
static GLuint progs[2]; /* indexed by num_varyings - 1 */
static GLuint query_prims_generated;
static GLuint query_prims_written;
void
piglit_init(int argc, char **argv)
{
GLuint vs;
int num_varyings;
piglit_require_GLSL();
piglit_require_transform_feedback();
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vstext);
for (num_varyings = 1; num_varyings <= 2; ++num_varyings) {
GLuint prog = piglit_CreateProgram();
piglit_AttachShader(prog, vs);
piglit_BindAttribLocation(prog, 0, "vertex_num");
glTransformFeedbackVaryings(prog, num_varyings, varyings,
GL_INTERLEAVED_ATTRIBS);
piglit_LinkProgram(prog);
if (!piglit_link_check_status(prog)) {
piglit_DeleteProgram(prog);
piglit_report_result(PIGLIT_FAIL);
}
progs[num_varyings - 1] = prog;
}
glGenBuffers(1, &xfb_buf);
glGenQueries(1, &query_prims_generated);
glGenQueries(1, &query_prims_written);
}
static GLenum modes[] = { GL_POINTS, GL_LINES, GL_TRIANGLES };
static const char *mode_names[] = {
"GL_POINTS", "GL_LINES", "GL_TRIANGLES"
};
static int mode_vertices_per_prim[] = { 1, 2, 3 };
static GLboolean
test(int bind_size, int num_varyings, int num_primitives, int mode_index)
{
float initial_xfb_buf[XFB_BUFFER_SIZE];
float vertex_data[MAX_VERTICES];
int i, j;
int vertices_per_prim = mode_vertices_per_prim[mode_index];
int expected_primitives_written =
MIN2(num_primitives,
bind_size / num_varyings / vertices_per_prim);
int expected_vertices_written =
expected_primitives_written * vertices_per_prim;
GLuint query_result;
GLboolean pass = GL_TRUE;
float expected_xfb_results[XFB_BUFFER_SIZE];
float *readback;
printf("size=%d, num_varyings=%d, num_primitives=%d, mode=%s: ",
bind_size, num_varyings, num_primitives,
mode_names[mode_index]);
/* Setup program and initial buffer contents */
piglit_UseProgram(progs[num_varyings - 1]);
for (i = 0; i < MAX_VERTICES; ++i)
vertex_data[i] = i;
glVertexAttribPointer(0, 1, GL_FLOAT, GL_FALSE, sizeof(float),
&vertex_data);
glEnableVertexAttribArray(0);
for (i = 0; i < XFB_BUFFER_SIZE; ++i)
initial_xfb_buf[i] = 0.0;
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, xfb_buf);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER, sizeof(initial_xfb_buf),
initial_xfb_buf, GL_STREAM_READ);
glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf, 0,
sizeof(float) * bind_size);
/* Start queries and XFB */
glBeginQuery(GL_PRIMITIVES_GENERATED, query_prims_generated);
glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN,
query_prims_written);
glBeginTransformFeedback(modes[mode_index]);
/* Draw */
glDrawArrays(modes[mode_index], 0, num_primitives * vertices_per_prim);
/* Stop XFB and check queries */
glEndTransformFeedback();
glEndQuery(GL_PRIMITIVES_GENERATED);
glGetQueryObjectuiv(query_prims_generated, GL_QUERY_RESULT,
&query_result);
if (query_result != num_primitives) {
printf("\n Expected %u primitives generated, got %u\n",
(unsigned) num_primitives, query_result);
pass = GL_FALSE;
}
glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
glGetQueryObjectuiv(query_prims_written, GL_QUERY_RESULT,
&query_result);
if (query_result != expected_primitives_written) {
printf("\n Expected %u primitives written, got %u",
(unsigned) expected_primitives_written, query_result);
pass = GL_FALSE;
}
/* Check transform feedback buffer */
memcpy(expected_xfb_results, initial_xfb_buf, sizeof(initial_xfb_buf));
for (i = 0; i < expected_vertices_written; ++i) {
for (j = 0; j < num_varyings; ++j) {
expected_xfb_results[i * num_varyings + j] =
100.0 * (j + 1) + i;
}
}
readback = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER,
GL_READ_ONLY);
for (i = 0; i < XFB_BUFFER_SIZE; ++i) {
if (expected_xfb_results[i] != readback[i]) {
printf("\n Expected buf[%i] = %f, got %f",
i, expected_xfb_results[i], readback[i]);
pass = GL_FALSE;
}
}
if (pass)
printf("PASS\n");
else
printf(" FAIL\n");
return pass;
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int bind_size, num_varyings, num_primitives, mode_index;
for (bind_size = 1; bind_size <= 6; ++bind_size) {
for (num_varyings = 1; num_varyings <= 2; ++num_varyings) {
for (num_primitives = 1; num_primitives <= 3; ++num_primitives) {
for (mode_index = 0; mode_index < 3; ++mode_index) {
pass = test(bind_size,
num_varyings,
num_primitives,
mode_index) && pass;
}
}
}
}
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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