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/*
* Copyright © 2010 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.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
/** @file fbo-drawbuffers-maxtargets.c
*
* Tests that drawing the same color to as many render targets as
* possible with ARB_draw_buffers and fixed function fragment works.
*/
#include <string.h>
#include "piglit-util.h"
#ifndef GL_COLOR_ATTACHMENT0
#define GL_COLOR_ATTACHMENT0 0x8CE0
#endif
int piglit_width = 256;
int piglit_height = 256;
int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
static GLint max_targets;
static char *vs_source =
"void main()\n"
"{\n"
" gl_Position = gl_Vertex;\n"
"}\n";
static char *fs_source =
"void main()\n"
"{\n"
" for (int i = 0; i < %d; i++) {\n"
" gl_FragData[i] = vec4(0.0, 1.0, 0.0, 0.0);\n"
" }\n"
"}\n";
static GLuint
attach_texture(int i)
{
GLuint tex;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
32, 32, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT + i,
GL_TEXTURE_2D,
tex,
0);
assert(glGetError() == 0);
return tex;
}
static void
generate_and_display_drawbuffers(int count)
{
GLuint tex[16], fb, fs, vs, prog;
GLenum attachments[16], status, error;
char *fs_count_source;
int i;
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
for (i = 0; i < count; i++) {
tex[i] = attach_texture(i);
attachments[i] = GL_COLOR_ATTACHMENT0 + i;
}
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
fprintf(stderr, "fbo incomplete (status = 0x%04x)\n", status);
piglit_report_result(PIGLIT_SKIP);
}
glDrawBuffersARB(count, attachments);
/* Clear all to red so we see if the shader rendering happens. */
glClearColor(1.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
/* Build the shader that spams green to all outputs. */
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
fs_count_source = malloc(strlen(fs_source) + 5);
sprintf(fs_count_source, fs_source, count);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_count_source);
free(fs_count_source);
prog = piglit_link_simple_program(vs, fs);
glUseProgram(prog);
error = glGetError();
if (error) {
fprintf(stderr, "glUseProgram error: 0x%x\n", error);
piglit_report_result(PIGLIT_FAILURE);
}
/* Now render to all the color buffers. */
piglit_draw_rect(-1, -1, 2, 2);
/* OK, now draw each of these textures to the winsys framebuffer. */
glUseProgram(0);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable(GL_TEXTURE_2D);
for (i = 0; i < count; i++) {
glBindTexture(GL_TEXTURE_2D, tex[i]);
piglit_draw_rect_tex(16 * i, 16 * (count - 1),
16, 16,
0, 0,
1, 1);
}
glDisable(GL_TEXTURE_2D);
for (i = 0; i < count; i++) {
glDeleteTextures(1, &tex[i]);
}
glDeleteFramebuffersEXT(1, &fb);
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
float green[] = {0, 1, 0, 0};
int count, i;
glClearColor(0.5, 0.5, 0.5, 0.5);
glClear(GL_COLOR_BUFFER_BIT);
for (count = 1; count <= max_targets; count++) {
generate_and_display_drawbuffers(count);
}
for (count = 1; count <= max_targets; count++) {
for (i = 0; i < count; i++) {
pass = pass &&
piglit_probe_pixel_rgb(16 * i + 8,
16 * (count - 1) + 8,
green);
}
}
glutSwapBuffers();
return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
}
void
piglit_init(int argc, char **argv)
{
GLint max_attachments;
printf("The result should be increasing lengths of rows of green\n"
"boxes as the test increases the number of drawbuffers \n"
"targets used.\n");
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
if (!GLEW_VERSION_2_0) {
printf("Requires OpenGL 2.0\n");
piglit_report_result(PIGLIT_SKIP);
}
piglit_require_extension("GL_EXT_framebuffer_object");
piglit_require_extension("GL_ARB_draw_buffers");
glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_targets);
if (max_targets < 2)
piglit_report_result(PIGLIT_SKIP);
glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &max_attachments);
if (max_targets > max_attachments)
max_targets = max_attachments;
if (max_targets > 16)
max_targets = 16;
}
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