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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.
*/
/**
* Test that transform feedback occurs before flatshading
*
* Section 2.16(Transform Feedback) of OpenGL 3.2 Core says:
* "In transform feedback mode, attributes of the vertices of transformed
* primitives processed by a vertex shader, or primitives generated by a
* geometry shader if one is active, are written out to one or more buffer
* objects. The vertices are fed back after vertex color clamping, but before
* flatshading and clipping."
*
*/
#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 130\n"
"in vec3 vert1;\n"
"in vec3 color;\n"
"flat out vec3 color1;\n"
"out vec3 vert;\n"
"void main() {\n"
" gl_Position = vec4(vert1, 1.);\n"
" vert = vert1;\n"
" color1 = color;\n"
"}\n";
static const char *fstext =
"#version 130\n"
"in vec3 vert;\n"
"flat in vec3 color1;\n"
"void main() {\n"
" gl_FragColor = vec4(color1, 1.);\n"
"}\n";
static GLuint vao;
static GLuint vertBuff;
static GLuint indexBuf;
static GLuint vertColorBuf;
static GLfloat vertices[] = {
-1.0, 1.0, 0.0,
1.0, 1.0, 0.0,
1.0,-1.0, 0.0,
-1.0,-1.0, 0.0
};
static GLsizei vertSize = sizeof(vertices);
static GLfloat vertColors[] = {
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
0.0, 1.0, 0.0
};
static GLsizei vertColorSize = sizeof(vertColors);
static GLuint indices[] = {
0, 1, 2, 0, 2, 3
};
static GLsizei indSize = sizeof(indices);
static GLuint xfb_buf;
static GLuint prog;
/* Only capture the color data into the transform feedback buffer */
static const char *varyings[] = { "color1" };
/* Calculate number of floats contained in the transform varyings */
static int numVaryingFloats = ARRAY_SIZE(varyings) * ARRAY_SIZE(indices) * 3;
void
piglit_init(int argc, char **argv)
{
bool pass = true;
GLuint vs = 0, fs = 0;
GLuint vertIndex;
GLuint vertColorIndex;
prog = glCreateProgram();
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vstext);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fstext);
glAttachShader(prog, vs);
glAttachShader(prog, fs);
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);
glGenBuffers(1, &vertBuff);
glBindBuffer(GL_ARRAY_BUFFER, vertBuff);
glBufferData(GL_ARRAY_BUFFER, vertSize, vertices, GL_STATIC_DRAW);
glGenBuffers(1, &indexBuf);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indSize,
indices, GL_STATIC_DRAW);
glGenBuffers(1, &vertColorBuf);
glBindBuffer(GL_ARRAY_BUFFER, vertColorBuf);
glBufferData(GL_ARRAY_BUFFER, vertColorSize,
vertColors, GL_STATIC_DRAW);
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
vertIndex = glGetAttribLocation(prog, "vert1");
vertColorIndex = glGetAttribLocation(prog, "color");
glBindBuffer(GL_ARRAY_BUFFER, vertBuff);
glEnableVertexAttribArray(vertIndex);
glVertexAttribPointer(vertIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
glBindBuffer(GL_ARRAY_BUFFER, vertColorBuf);
glEnableVertexAttribArray(vertColorIndex);
glVertexAttribPointer(vertColorIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
glGenBuffers(1, &xfb_buf);
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
numVaryingFloats * sizeof(float),
NULL, GL_STREAM_READ);
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
}
enum piglit_result
piglit_display(void)
{
float *xBuffer;
int i;
bool pass = true;
glClearColor(0.2, 0.2, 0.2, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glBindVertexArray(vao);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
glBeginTransformFeedback(GL_TRIANGLES);
glDrawElements(GL_TRIANGLES, ARRAY_SIZE(indices),
GL_UNSIGNED_INT, NULL);
glEndTransformFeedback();
xBuffer = (float*)glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, GL_READ_ONLY);
/* Compare transform feedback color data with original color data */
for(i = 0; i < numVaryingFloats/3; i++) {
bool unchanged = true;
if(xBuffer[i*3+0] != vertColors[0+3*indices[i]])
unchanged = false;
if(xBuffer[i*3+1] != vertColors[1+3*indices[i]])
unchanged = false;
if(xBuffer[i*3+2] != vertColors[2+3*indices[i]])
unchanged = false;
if(!unchanged) {
printf("Incorrect data for vertex %d:\n", i);
printf("Expected (%f, %f, %f)\n",
vertColors[0+3*indices[i]],
vertColors[1+3*indices[i]],
vertColors[2+3*indices[i]]);
printf("Actual (%f, %f, %f)\n",
xBuffer[i*3+0],
xBuffer[i*3+1],
xBuffer[i*3+2]);
pass = false;
}
}
glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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