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UVEdit: Add back uv angle stretch aspect correction 

This is now done in shader so that the batches are shared across ImageUV
areas.
This commit is contained in:
Clément Foucault 2019-01-10 17:59:11 +01:00
parent 5f3fdee53a
commit 621a6d4a5d
5 changed files with 62 additions and 13 deletions
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25
source/blender/draw/intern/draw_cache_impl_mesh.c
View File

@ -4771,7 +4771,7 @@ BLI_INLINE float edit_uv_get_stretch_area(float area, float uvarea)
/* Compute face's normalized contour vectors. */
BLI_INLINE void edit_uv_preprocess_stretch_angle(
float (*auv)[2], float (*av)[3], const int cd_loop_uv_offset, BMFace *efa, float asp[2])
float (*auv)[2], float (*av)[3], const int cd_loop_uv_offset, BMFace *efa)
{
BMLoop *l;
BMIter liter;
@ -4781,7 +4781,6 @@ BLI_INLINE void edit_uv_preprocess_stretch_angle(
MLoopUV *luv_prev = BM_ELEM_CD_GET_VOID_P(l->prev, cd_loop_uv_offset);
sub_v2_v2v2(auv[i], luv_prev->uv, luv->uv);
mul_v2_v2(auv[i], asp);
normalize_v2(auv[i]);
sub_v3_v3v3(av[i], l->prev->v->co, l->v->co);
@ -4789,6 +4788,7 @@ BLI_INLINE void edit_uv_preprocess_stretch_angle(
}
}
#if 0 /* here for reference, this is done in shader now. */
BLI_INLINE float edit_uv_get_loop_stretch_angle(
const float auv0[2], const float auv1[2], const float av0[3], const float av1[3])
{
@ -4797,6 +4797,7 @@ BLI_INLINE float edit_uv_get_loop_stretch_angle(
float stretch = fabsf(uvang - ang) / (float)M_PI;
return 1.0f - pow2f(1.0f - stretch);
}
#endif
#define VERTEX_SELECT (1 << 0)
#define VERTEX_PINNED (1 << 1)
@ -4823,7 +4824,7 @@ BLI_INLINE uchar edit_uv_get_loop_flag(BMLoop *l, const int cd_loop_uv_offset, S
}
static struct EditUVFormatIndex {
uint uvs, area, angle, flag, fdots_uvs, fdots_flag;
uint uvs, area, angle, uv_adj, flag, fdots_uvs, fdots_flag;
} uv_attr_id = {0};
static void uvedit_fill_buffer_data(
@ -4885,10 +4886,7 @@ static void uvedit_fill_buffer_data(
if (vbo_angle) {
av = (float (*)[3])BLI_buffer_reinit_data(&vec3_buf, vec3f, efa_len);
auv = (float (*)[2])BLI_buffer_reinit_data(&vec2_buf, vec2f, efa_len);
/* TODO modify shader to apply the correct aspect on the fly, or get the correct aspect.
* But later solution would make it correct only in one editor at a time. */
float asp[2] = {1.0f, 1.0f};
edit_uv_preprocess_stretch_angle(auv, av, cd_loop_uv_offset, efa, asp);
edit_uv_preprocess_stretch_angle(auv, av, cd_loop_uv_offset, efa);
}
BM_ITER_ELEM_INDEX(l, &liter, efa, BM_LOOPS_OF_FACE, i) {
@ -4897,8 +4895,14 @@ static void uvedit_fill_buffer_data(
GPU_vertbuf_attr_set(vbo_area, uv_attr_id.area, vidx, &area_stretch);
}
if (vbo_angle) {
ushort angle = 65534.0f * edit_uv_get_loop_stretch_angle(auv[i], auv[(i + 1) % efa_len],
av[i], av[(i + 1) % efa_len]);
int i_next = (i + 1) % efa_len;
short suv[4];
/* Send uvs to the shader and let it compute the aspect corrected angle. */
normal_float_to_short_v2(&suv[0], auv[i]);
normal_float_to_short_v2(&suv[2], auv[i_next]);
GPU_vertbuf_attr_set(vbo_angle, uv_attr_id.uv_adj, vidx, suv);
/* Compute 3D angle here */
short angle = 32767.0f * angle_normalized_v3v3(av[i], av[i_next]) / (float)M_PI;
GPU_vertbuf_attr_set(vbo_angle, uv_attr_id.angle, vidx, &angle);
}
if (vbo_pos) {
@ -4978,7 +4982,8 @@ static void mesh_create_uvedit_buffers(
if (format_pos.attr_len == 0) {
uv_attr_id.area = GPU_vertformat_attr_add(&format_area, "stretch", GPU_COMP_U16, 1, GPU_FETCH_INT_TO_FLOAT_UNIT);
uv_attr_id.angle = GPU_vertformat_attr_add(&format_angle, "stretch", GPU_COMP_U16, 1, GPU_FETCH_INT_TO_FLOAT_UNIT);
uv_attr_id.angle = GPU_vertformat_attr_add(&format_angle, "angle", GPU_COMP_I16, 1, GPU_FETCH_INT_TO_FLOAT_UNIT);
uv_attr_id.uv_adj = GPU_vertformat_attr_add(&format_angle, "uv_adj", GPU_COMP_I16, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
uv_attr_id.flag = GPU_vertformat_attr_add(&format_flag, "flag", GPU_COMP_U8, 1, GPU_FETCH_INT);
uv_attr_id.uvs = GPU_vertformat_attr_add(&format_pos, "u", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
GPU_vertformat_alias_add(&format_pos, "pos");

9
source/blender/editors/uvedit/uvedit_draw.c
View File

@ -305,7 +305,9 @@ static void draw_uvs(SpaceImage *sima, Scene *scene, Object *obedit, Depsgraph *
if (faces) {
GPU_batch_program_set_builtin(faces, (draw_stretch)
? GPU_SHADER_2D_UV_FACES_STRETCH
? (sima->dt_uvstretch == SI_UVDT_STRETCH_AREA)
? GPU_SHADER_2D_UV_FACES_STRETCH_AREA
: GPU_SHADER_2D_UV_FACES_STRETCH_ANGLE
: GPU_SHADER_2D_UV_FACES);
if (!draw_stretch) {
@ -319,6 +321,11 @@ static void draw_uvs(SpaceImage *sima, Scene *scene, Object *obedit, Depsgraph *
GPU_batch_uniform_4fv(faces, "selectColor", col2);
GPU_batch_uniform_4fv(faces, "activeColor", col3);
}
else if (sima->dt_uvstretch == SI_UVDT_STRETCH_ANGLE) {
float asp[2];
ED_space_image_get_uv_aspect(sima, &asp[0], &asp[1]);
GPU_batch_uniform_2fv(faces, "aspect", asp);
}
GPU_batch_draw(faces);

3
source/blender/gpu/GPU_shader.h
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@ -349,7 +349,8 @@ typedef enum GPUBuiltinShader {
GPU_SHADER_2D_UV_EDGES,
GPU_SHADER_2D_UV_EDGES_SMOOTH,
GPU_SHADER_2D_UV_FACES,
GPU_SHADER_2D_UV_FACES_STRETCH,
GPU_SHADER_2D_UV_FACES_STRETCH_AREA,
GPU_SHADER_2D_UV_FACES_STRETCH_ANGLE,
/* Selection */
GPU_SHADER_3D_FLAT_SELECT_ID,
GPU_SHADER_3D_UNIFORM_SELECT_ID,

8
source/blender/gpu/intern/gpu_shader.c
View File

@ -933,7 +933,10 @@ static const GPUShaderStages builtin_shader_stages[GPU_NUM_BUILTIN_SHADERS] = {
[GPU_SHADER_2D_UV_FACES] =
{ datatoc_gpu_shader_2D_edituvs_faces_vert_glsl,
datatoc_gpu_shader_flat_color_frag_glsl },
[GPU_SHADER_2D_UV_FACES_STRETCH] =
[GPU_SHADER_2D_UV_FACES_STRETCH_AREA] =
{ datatoc_gpu_shader_2D_edituvs_stretch_vert_glsl,
datatoc_gpu_shader_2D_smooth_color_frag_glsl },
[GPU_SHADER_2D_UV_FACES_STRETCH_ANGLE] =
{ datatoc_gpu_shader_2D_edituvs_stretch_vert_glsl,
datatoc_gpu_shader_2D_smooth_color_frag_glsl },
@ -1010,6 +1013,9 @@ static const char *gpu_shader_get_builtin_shader_defines(
case GPU_SHADER_3D_UNIFORM_SELECT_ID:
return "#define UNIFORM_ID\n";
case GPU_SHADER_2D_UV_FACES_STRETCH_ANGLE:
return "#define STRETCH_ANGLE\n";
default:
return NULL;
}

30
source/blender/gpu/shaders/gpu_shader_2D_edituvs_stretch_vert.glsl
View File

@ -1,8 +1,16 @@
uniform mat4 ModelViewProjectionMatrix;
uniform vec2 aspect;
in vec2 pos;
#ifndef STRETCH_ANGLE
in float stretch;
#else
in vec4 uv_adj;
in float angle;
#endif
noperspective out vec4 finalColor;
@ -42,8 +50,30 @@ vec3 weight_to_rgb(float weight)
return r_rgb;
}
#define M_PI 3.1415926535897932
/* Adapted from BLI_math_vector.h */
float angle_normalized_v2v2(vec2 v1, vec2 v2)
{
v1 = normalize(v1 * aspect);
v2 = normalize(v2 * aspect);
/* this is the same as acos(dot_v3v3(v1, v2)), but more accurate */
bool q = (dot(v1, v2) >= 0.0);
vec2 v = (q) ? (v1 - v2) : (v1 + v2);
float a = 2.0 * asin(length(v) / 2.0);
return (q) ? a : M_PI - a;
}
void main()
{
gl_Position = ModelViewProjectionMatrix * vec4(pos, 0.0, 1.0);
#ifdef STRETCH_ANGLE
float uv_angle = angle_normalized_v2v2(uv_adj.xy, uv_adj.zw) / M_PI;
float stretch = 1.0 - abs(uv_angle - angle);
stretch = stretch;
stretch = 1.0 - stretch * stretch;
#endif
finalColor = vec4(weight_to_rgb(stretch), 1.0);
}