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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2020, Blender Foundation.
*/
/** \file
* \ingroup draw_engine
*
* EEVEE LUT generation:
*
* Routine to generate the LUT used by eevee stored in eevee_lut.h
* Theses functions are not to be used in the final executable.
*/
#include "DRW_render.h"
#include "BLI_alloca.h"
#include "BLI_rand.h"
#include "BLI_string_utils.h"
extern char datatoc_bsdf_lut_frag_glsl[];
extern char datatoc_btdf_lut_frag_glsl[];
extern char datatoc_bsdf_common_lib_glsl[];
extern char datatoc_bsdf_sampling_lib_glsl[];
extern char datatoc_lightprobe_geom_glsl[];
extern char datatoc_lightprobe_vert_glsl[];
static struct GPUTexture *create_ggx_lut_texture(int UNUSED(w), int UNUSED(h))
{
struct GPUTexture *tex;
struct GPUFrameBuffer *fb = NULL;
static float samples_len = 8192.0f;
static float inv_samples_len = 1.0f / 8192.0f;
char *lib_str = BLI_string_joinN(datatoc_bsdf_common_lib_glsl, datatoc_bsdf_sampling_lib_glsl);
struct GPUShader *sh = DRW_shader_create_with_lib(datatoc_lightprobe_vert_glsl,
datatoc_lightprobe_geom_glsl,
datatoc_bsdf_lut_frag_glsl,
lib_str,
"#define HAMMERSLEY_SIZE 8192\n"
"#define BRDF_LUT_SIZE 64\n"
"#define NOISE_SIZE 64\n");
DRWPass *pass = DRW_pass_create("LightProbe Filtering", DRW_STATE_WRITE_COLOR);
DRWShadingGroup *grp = DRW_shgroup_create(sh, pass);
DRW_shgroup_uniform_float(grp, "sampleCount", &samples_len, 1);
DRW_shgroup_uniform_float(grp, "invSampleCount", &inv_samples_len, 1);
DRW_shgroup_uniform_texture(grp, "texHammersley", e_data.hammersley);
DRW_shgroup_uniform_texture(grp, "texJitter", e_data.jitter);
struct GPUBatch *geom = DRW_cache_fullscreen_quad_get();
DRW_shgroup_call(grp, geom, NULL);
float *texels = MEM_mallocN(sizeof(float[2]) * w * h, "lut");
tex = DRW_texture_create_2d(w, h, GPU_RG16F, DRW_TEX_FILTER, (float *)texels);
DRWFboTexture tex_filter = {&tex, GPU_RG16F, DRW_TEX_FILTER};
GPU_framebuffer_init(&fb, &draw_engine_eevee_type, w, h, &tex_filter, 1);
GPU_framebuffer_bind(fb);
DRW_draw_pass(pass);
float *data = MEM_mallocN(sizeof(float[3]) * w * h, "lut");
glReadBuffer(GL_COLOR_ATTACHMENT0);
glReadPixels(0, 0, w, h, GL_RGB, GL_FLOAT, data);
printf("{");
for (int i = 0; i < w * h * 3; i += 3) {
printf("%ff, %ff, ", data[i], data[i + 1]);
i += 3;
printf("%ff, %ff, ", data[i], data[i + 1]);
i += 3;
printf("%ff, %ff, ", data[i], data[i + 1]);
i += 3;
printf("%ff, %ff, \n", data[i], data[i + 1]);
}
printf("}");
MEM_freeN(texels);
MEM_freeN(data);
return tex;
}
static struct GPUTexture *create_ggx_refraction_lut_texture(int w, int h)
{
struct GPUTexture *tex;
struct GPUTexture *hammersley = create_hammersley_sample_texture(8192);
struct GPUFrameBuffer *fb = NULL;
static float samples_len = 8192.0f;
static float a2 = 0.0f;
static float inv_samples_len = 1.0f / 8192.0f;
char *frag_str = BLI_string_joinN(
datatoc_bsdf_common_lib_glsl, datatoc_bsdf_sampling_lib_glsl, datatoc_btdf_lut_frag_glsl);
struct GPUShader *sh = DRW_shader_create_fullscreen(frag_str,
"#define HAMMERSLEY_SIZE 8192\n"
"#define BRDF_LUT_SIZE 64\n"
"#define NOISE_SIZE 64\n"
"#define LUT_SIZE 64\n");
MEM_freeN(frag_str);
DRWPass *pass = DRW_pass_create("LightProbe Filtering", DRW_STATE_WRITE_COLOR);
DRWShadingGroup *grp = DRW_shgroup_create(sh, pass);
DRW_shgroup_uniform_float(grp, "a2", &a2, 1);
DRW_shgroup_uniform_float(grp, "sampleCount", &samples_len, 1);
DRW_shgroup_uniform_float(grp, "invSampleCount", &inv_samples_len, 1);
DRW_shgroup_uniform_texture(grp, "texHammersley", hammersley);
DRW_shgroup_uniform_texture(grp, "utilTex", e_data.util_tex);
struct GPUBatch *geom = DRW_cache_fullscreen_quad_get();
DRW_shgroup_call(grp, geom, NULL);
float *texels = MEM_mallocN(sizeof(float[2]) * w * h, "lut");
tex = DRW_texture_create_2d(w, h, GPU_R16F, DRW_TEX_FILTER, (float *)texels);
DRWFboTexture tex_filter = {&tex, GPU_R16F, DRW_TEX_FILTER};
GPU_framebuffer_init(&fb, &draw_engine_eevee_type, w, h, &tex_filter, 1);
GPU_framebuffer_bind(fb);
float *data = MEM_mallocN(sizeof(float[3]) * w * h, "lut");
float inc = 1.0f / 31.0f;
float roughness = 1e-8f - inc;
FILE *f = BLI_fopen("btdf_split_sum_ggx.h", "w");
fprintf(f, "static float btdf_split_sum_ggx[32][64 * 64] = {\n");
do {
roughness += inc;
CLAMP(roughness, 1e-4f, 1.0f);
a2 = powf(roughness, 4.0f);
DRW_draw_pass(pass);
GPU_framebuffer_read_data(0, 0, w, h, 3, 0, data);
#if 1
fprintf(f, "\t{\n\t\t");
for (int i = 0; i < w * h * 3; i += 3) {
fprintf(f, "%ff,", data[i]);
if (((i / 3) + 1) % 12 == 0) {
fprintf(f, "\n\t\t");
}
else {
fprintf(f, " ");
}
}
fprintf(f, "\n\t},\n");
#else
for (int i = 0; i < w * h * 3; i += 3) {
if (data[i] < 0.01) {
printf(" ");
}
else if (data[i] < 0.3) {
printf(".");
}
else if (data[i] < 0.6) {
printf("+");
}
else if (data[i] < 0.9) {
printf("%%");
}
else {
printf("#");
}
if ((i / 3 + 1) % 64 == 0) {
printf("\n");
}
}
#endif
} while (roughness < 1.0f);
fprintf(f, "\n};\n");
fclose(f);
MEM_freeN(texels);
MEM_freeN(data);
return tex;
}
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