Campbell Barton
c434782e3a
Use a shorter/simpler license convention, stops the header taking so much space. Follow the SPDX license specification: https://spdx.org/licenses - C/C++/objc/objc++ - Python - Shell Scripts - CMake, GNUmakefile While most of the source tree has been included - `./extern/` was left out. - `./intern/cycles` & `./intern/atomic` are also excluded because they use different header conventions. doc/license/SPDX-license-identifiers.txt has been added to list SPDX all used identifiers. See P2788 for the script that automated these edits. Reviewed By: brecht, mont29, sergey Ref D14069
109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
|
|
* Copyright 2020 Blender Foundation. */
|
|
|
|
/** \file
|
|
* \ingroup draw_engine
|
|
*
|
|
* EEVEE LUT generation:
|
|
*
|
|
* Routine to generate the LUT used by eevee stored in eevee_lut.h
|
|
* These functions are not to be used in the final executable.
|
|
*/
|
|
|
|
#include "DRW_render.h"
|
|
|
|
#include "BLI_fileops.h"
|
|
#include "BLI_rand.h"
|
|
#include "BLI_string_utils.h"
|
|
|
|
#include "eevee_private.h"
|
|
|
|
#define DO_FILE_OUTPUT 0
|
|
|
|
float *EEVEE_lut_update_ggx_brdf(int lut_size)
|
|
{
|
|
DRWPass *pass = DRW_pass_create(__func__, DRW_STATE_WRITE_COLOR);
|
|
DRWShadingGroup *grp = DRW_shgroup_create(EEVEE_shaders_ggx_lut_sh_get(), pass);
|
|
DRW_shgroup_uniform_float_copy(grp, "sampleCount", 64.0f); /* Actual sample count is squared. */
|
|
DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
|
|
|
|
GPUTexture *tex = DRW_texture_create_2d(lut_size, lut_size, GPU_RG16F, 0, NULL);
|
|
GPUFrameBuffer *fb = NULL;
|
|
GPU_framebuffer_ensure_config(&fb,
|
|
{
|
|
GPU_ATTACHMENT_NONE,
|
|
GPU_ATTACHMENT_TEXTURE(tex),
|
|
});
|
|
GPU_framebuffer_bind(fb);
|
|
DRW_draw_pass(pass);
|
|
GPU_FRAMEBUFFER_FREE_SAFE(fb);
|
|
|
|
float *data = GPU_texture_read(tex, GPU_DATA_FLOAT, 0);
|
|
GPU_texture_free(tex);
|
|
#if DO_FILE_OUTPUT
|
|
/* Content is to be put inside eevee_lut.c */
|
|
FILE *f = BLI_fopen("bsdf_split_sum_ggx.h", "w");
|
|
fprintf(f, "const float bsdf_split_sum_ggx[%d * %d * 2] = {", lut_size, lut_size);
|
|
for (int i = 0; i < lut_size * lut_size * 2;) {
|
|
fprintf(f, "\n ");
|
|
for (int j = 0; j < 4; j++, i += 2) {
|
|
fprintf(f, "%ff, %ff, ", data[i], data[i + 1]);
|
|
}
|
|
}
|
|
fprintf(f, "\n};\n");
|
|
fclose(f);
|
|
#endif
|
|
|
|
return data;
|
|
}
|
|
|
|
float *EEVEE_lut_update_ggx_btdf(int lut_size, int lut_depth)
|
|
{
|
|
float roughness;
|
|
DRWPass *pass = DRW_pass_create(__func__, DRW_STATE_WRITE_COLOR);
|
|
DRWShadingGroup *grp = DRW_shgroup_create(EEVEE_shaders_ggx_refraction_lut_sh_get(), pass);
|
|
DRW_shgroup_uniform_float_copy(grp, "sampleCount", 64.0f); /* Actual sample count is squared. */
|
|
DRW_shgroup_uniform_float(grp, "z", &roughness, 1);
|
|
DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
|
|
|
|
GPUTexture *tex = DRW_texture_create_2d_array(lut_size, lut_size, lut_depth, GPU_RG16F, 0, NULL);
|
|
GPUFrameBuffer *fb = NULL;
|
|
for (int i = 0; i < lut_depth; i++) {
|
|
GPU_framebuffer_ensure_config(&fb,
|
|
{
|
|
GPU_ATTACHMENT_NONE,
|
|
GPU_ATTACHMENT_TEXTURE_LAYER(tex, i),
|
|
});
|
|
GPU_framebuffer_bind(fb);
|
|
roughness = i / (lut_depth - 1.0f);
|
|
DRW_draw_pass(pass);
|
|
}
|
|
|
|
GPU_FRAMEBUFFER_FREE_SAFE(fb);
|
|
|
|
float *data = GPU_texture_read(tex, GPU_DATA_FLOAT, 0);
|
|
GPU_texture_free(tex);
|
|
|
|
#if DO_FILE_OUTPUT
|
|
/* Content is to be put inside eevee_lut.c. Don't forget to format the output. */
|
|
FILE *f = BLI_fopen("btdf_split_sum_ggx.h", "w");
|
|
fprintf(f, "const float btdf_split_sum_ggx[%d][%d * %d * 2] = {", lut_depth, lut_size, lut_size);
|
|
fprintf(f, "\n ");
|
|
int ofs = 0;
|
|
for (int d = 0; d < lut_depth; d++) {
|
|
fprintf(f, "{\n");
|
|
for (int i = 0; i < lut_size * lut_size * 2;) {
|
|
for (int j = 0; j < 4; j++, i += 2, ofs += 2) {
|
|
fprintf(f, "%ff, %ff, ", data[ofs], data[ofs + 1]);
|
|
}
|
|
fprintf(f, "\n ");
|
|
}
|
|
fprintf(f, "},\n");
|
|
}
|
|
fprintf(f, "};\n");
|
|
fclose(f);
|
|
#endif
|
|
|
|
return data;
|
|
}
|