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/*
* Copyright © 2011 Marek Olšák <maraeo@gmail.com>
*
* 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.
*/
/**
* EXT_transform_feedback test.
*
* Test writing interleaved vertex attribs into a buffer object.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
PIGLIT_GL_TEST_CONFIG_END
static const char *vstext = {
"varying vec3 v3;"
"varying vec2 v2;"
"void main() {"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;"
" gl_FrontColor = vec4(1.0, 0.9, 0.8, 0.7);"
" gl_TexCoord[0] = vec4(0.5);"
" gl_TexCoord[1] = vec4(0.6, 0.0, 0.1, 0.6);"
" v2 = vec2(0.2, 0.7);"
" v3 = vec3(0.55, 0.66, 0.77);"
"}"
};
static const char *varyings[] = {"v3", "gl_FrontColor", "v2", "gl_Position", "gl_TexCoord[1]"};
GLuint buf;
GLuint prog;
#define BUF_FLOATS (17*6)
void piglit_init(int argc, char **argv)
{
GLuint vs, i;
GLint maxcomps;
float *ptr;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
/* Check the driver. */
piglit_require_gl_version(15);
piglit_require_GLSL();
piglit_require_transform_feedback();
glGetIntegerv(GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT, &maxcomps);
if (maxcomps < 17) {
fprintf(stderr, "Not enough interleaved components supported by transform feedback.\n");
piglit_report_result(PIGLIT_SKIP);
}
/* Create shaders. */
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vstext);
prog = glCreateProgram();
glAttachShader(prog, vs);
glTransformFeedbackVaryings(prog, sizeof(varyings)/sizeof(varyings[0]),
varyings, GL_INTERLEAVED_ATTRIBS_EXT);
glLinkProgram(prog);
if (!piglit_link_check_status(prog)) {
glDeleteProgram(prog);
piglit_report_result(PIGLIT_FAIL);
}
/* Set up the transform feedback buffer. */
glGenBuffers(1, &buf);
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, buf);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER_EXT,
BUF_FLOATS*sizeof(float), NULL, GL_STREAM_READ);
ptr = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, GL_WRITE_ONLY);
for (i = 0; i < BUF_FLOATS; i++) {
ptr[i] = 0.123456;
}
glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, 0, buf);
assert(glGetError() == 0);
glClearColor(0.2, 0.2, 0.2, 1.0);
glEnableClientState(GL_VERTEX_ARRAY);
}
enum piglit_result piglit_display(void)
{
GLboolean pass = GL_TRUE;
float *ptr;
unsigned i;
static const float verts[] = {
10, 10,
10, 20,
20, 20,
20, 10
};
static const unsigned indices[] = {
0, 1, 3, 1, 2, 3
};
static const float expected[] = {
0.550000, 0.660000, 0.770000,
1.000000, 0.900000, 0.800000, 0.700000,
0.200000, 0.700000,
-0.687500, -0.375000, 0.000000, 1.000000,
0.600000, 0.000000, 0.100000, 0.600000,
0.550000, 0.660000, 0.770000,
1.000000, 0.900000, 0.800000, 0.700000,
0.200000, 0.700000,
-0.687500, 0.250000, 0.000000, 1.000000,
0.600000, 0.000000, 0.100000, 0.600000,
0.550000, 0.660000, 0.770000,
1.000000, 0.900000, 0.800000, 0.700000,
0.200000, 0.700000,
-0.375000, -0.375000, 0.000000, 1.000000,
0.600000, 0.000000, 0.100000, 0.600000,
0.550000, 0.660000, 0.770000,
1.000000, 0.900000, 0.800000, 0.700000,
0.200000, 0.700000,
-0.687500, 0.250000, 0.000000, 1.000000,
0.600000, 0.000000, 0.100000, 0.600000,
0.550000, 0.660000, 0.770000,
1.000000, 0.900000, 0.800000, 0.700000,
0.200000, 0.700000,
-0.375000, 0.250000, 0.000000, 1.000000,
0.600000, 0.000000, 0.100000, 0.600000,
0.550000, 0.660000, 0.770000,
1.000000, 0.900000, 0.800000, 0.700000,
0.200000, 0.700000,
-0.375000, -0.375000, 0.000000, 1.000000,
0.600000, 0.000000, 0.100000, 0.600000
};
glClear(GL_COLOR_BUFFER_BIT);
/* Setup projection for a 64 x 32 window region. That's what
* the expected coords above assume.
* XXX it would be better if the position coords in the above
* array were compute instead of fixed.
*/
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 64, 0, 32, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* Render into TFBO. */
glUseProgram(prog);
glEnable(GL_RASTERIZER_DISCARD);
glBeginTransformFeedback(GL_TRIANGLES);
glVertexPointer(2, GL_FLOAT, 0, verts);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, indices);
glEndTransformFeedback();
glDisable(GL_RASTERIZER_DISCARD);
assert(glGetError() == 0);
ptr = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, GL_READ_ONLY);
for (i = 0; i < BUF_FLOATS; i++) {
//printf("%f, ", ptr[i]); continue;
if (fabs(ptr[i] - expected[i]) > 0.01) {
printf("Buffer[%i]: %f, Expected: %f\n", i, ptr[i], expected[i]);
pass = GL_FALSE;
} else {
printf("Buffer[%i]: %f, Expected: %f -- OK\n", i, ptr[i], expected[i]);
}
}
//puts("");
glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT);
assert(glGetError() == 0);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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