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blender-archive/source/blender/editors/screen/glutil.c

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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.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*/
/** \file
* \ingroup edscr
*/
#include <stdio.h>
#include <string.h>
#include "DNA_userdef_types.h"
#include "DNA_vec_types.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "BKE_context.h"
#include "BIF_glutil.h"
#include "IMB_colormanagement.h"
#include "IMB_imbuf_types.h"
#include "GPU_immediate.h"
#include "GPU_matrix.h"
#ifdef __APPLE__
# include "GPU_state.h"
#endif
#include "UI_interface.h"
/* ******************************************** */
static int get_cached_work_texture(int *r_w, int *r_h)
{
static GLint texid = -1;
static int tex_w = 256;
static int tex_h = 256;
if (texid == -1) {
glGenTextures(1, (GLuint *)&texid);
glBindTexture(GL_TEXTURE_2D, texid);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_w, tex_h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
}
*r_w = tex_w;
*r_h = tex_h;
return texid;
}
static void immDrawPixelsTexSetupAttributes(IMMDrawPixelsTexState *state)
{
GPUVertFormat *vert_format = immVertexFormat();
state->pos = GPU_vertformat_attr_add(vert_format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
state->texco = GPU_vertformat_attr_add(
vert_format, "texCoord", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
}
/* To be used before calling immDrawPixelsTex
* Default shader is GPU_SHADER_2D_IMAGE_COLOR
* You can still set uniforms with :
* GPU_shader_uniform_int(shader, GPU_shader_get_uniform_ensure(shader, "name"), 0);
* */
IMMDrawPixelsTexState immDrawPixelsTexSetup(int builtin)
{
IMMDrawPixelsTexState state;
immDrawPixelsTexSetupAttributes(&state);
state.shader = GPU_shader_get_builtin_shader(builtin);
/* Shader will be unbind by immUnbindProgram in immDrawPixelsTexScaled_clipping */
immBindBuiltinProgram(builtin);
immUniform1i("image", 0);
state.do_shader_unbind = true;
return state;
}
/* Use the currently bound shader.
*
* Use immDrawPixelsTexSetup to bind the shader you
* want before calling immDrawPixelsTex.
*
* If using a special shader double check it uses the same
* attributes "pos" "texCoord" and uniform "image".
*
* If color is NULL then use white by default
*
* Be also aware that this function unbinds the shader when
* it's finished.
* */
void immDrawPixelsTexScaled_clipping(IMMDrawPixelsTexState *state,
float x,
float y,
int img_w,
int img_h,
int format,
int type,
int zoomfilter,
void *rect,
float scaleX,
float scaleY,
float clip_min_x,
float clip_min_y,
float clip_max_x,
float clip_max_y,
float xzoom,
float yzoom,
float color[4])
{
unsigned char *uc_rect = (unsigned char *)rect;
const float *f_rect = (float *)rect;
int subpart_x, subpart_y, tex_w, tex_h;
int seamless, offset_x, offset_y, nsubparts_x, nsubparts_y;
int texid = get_cached_work_texture(&tex_w, &tex_h);
int components;
const bool use_clipping = ((clip_min_x < clip_max_x) && (clip_min_y < clip_max_y));
float white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
GLint unpack_row_length;
glGetIntegerv(GL_UNPACK_ROW_LENGTH, &unpack_row_length);
glPixelStorei(GL_UNPACK_ROW_LENGTH, img_w);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texid);
/* don't want nasty border artifacts */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, zoomfilter);
/* setup seamless 2=on, 0=off */
seamless = ((tex_w < img_w || tex_h < img_h) && tex_w > 2 && tex_h > 2) ? 2 : 0;
offset_x = tex_w - seamless;
offset_y = tex_h - seamless;
nsubparts_x = (img_w + (offset_x - 1)) / (offset_x);
nsubparts_y = (img_h + (offset_y - 1)) / (offset_y);
if (format == GL_RGBA) {
components = 4;
}
else if (format == GL_RGB) {
components = 3;
}
else if (format == GL_RED) {
components = 1;
}
else {
BLI_assert(!"Incompatible format passed to glaDrawPixelsTexScaled");
return;
}
if (type == GL_FLOAT) {
/* need to set internal format to higher range float */
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, tex_w, tex_h, 0, format, GL_FLOAT, NULL);
}
else {
/* switch to 8bit RGBA for byte buffer */
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_w, tex_h, 0, format, GL_UNSIGNED_BYTE, NULL);
}
unsigned int pos = state->pos, texco = state->texco;
/* optional */
/* NOTE: Shader could be null for GLSL OCIO drawing, it is fine, since
* it does not need color.
*/
if (state->shader != NULL && GPU_shader_get_uniform_ensure(state->shader, "color") != -1) {
immUniformColor4fv((color) ? color : white);
}
for (subpart_y = 0; subpart_y < nsubparts_y; subpart_y++) {
for (subpart_x = 0; subpart_x < nsubparts_x; subpart_x++) {
int remainder_x = img_w - subpart_x * offset_x;
int remainder_y = img_h - subpart_y * offset_y;
int subpart_w = (remainder_x < tex_w) ? remainder_x : tex_w;
int subpart_h = (remainder_y < tex_h) ? remainder_y : tex_h;
int offset_left = (seamless && subpart_x != 0) ? 1 : 0;
int offset_bot = (seamless && subpart_y != 0) ? 1 : 0;
int offset_right = (seamless && remainder_x > tex_w) ? 1 : 0;
int offset_top = (seamless && remainder_y > tex_h) ? 1 : 0;
float rast_x = x + subpart_x * offset_x * xzoom;
float rast_y = y + subpart_y * offset_y * yzoom;
/* check if we already got these because we always get 2 more when doing seamless */
if (subpart_w <= seamless || subpart_h <= seamless) {
continue;
}
if (use_clipping) {
if (rast_x + (float)(subpart_w - offset_right) * xzoom * scaleX < clip_min_x ||
rast_y + (float)(subpart_h - offset_top) * yzoom * scaleY < clip_min_y) {
continue;
}
if (rast_x + (float)offset_left * xzoom > clip_max_x ||
rast_y + (float)offset_bot * yzoom > clip_max_y) {
continue;
}
}
if (type == GL_FLOAT) {
glTexSubImage2D(GL_TEXTURE_2D,
0,
0,
0,
subpart_w,
subpart_h,
format,
GL_FLOAT,
&f_rect[((size_t)subpart_y) * offset_y * img_w * components +
subpart_x * offset_x * components]);
/* add an extra border of pixels so linear looks ok at edges of full image */
if (subpart_w < tex_w) {
glTexSubImage2D(GL_TEXTURE_2D,
0,
subpart_w,
0,
1,
subpart_h,
format,
GL_FLOAT,
&f_rect[((size_t)subpart_y) * offset_y * img_w * components +
(subpart_x * offset_x + subpart_w - 1) * components]);
}
if (subpart_h < tex_h) {
glTexSubImage2D(
GL_TEXTURE_2D,
0,
0,
subpart_h,
subpart_w,
1,
format,
GL_FLOAT,
&f_rect[(((size_t)subpart_y) * offset_y + subpart_h - 1) * img_w * components +
subpart_x * offset_x * components]);
}
if (subpart_w < tex_w && subpart_h < tex_h) {
glTexSubImage2D(
GL_TEXTURE_2D,
0,
subpart_w,
subpart_h,
1,
1,
format,
GL_FLOAT,
&f_rect[(((size_t)subpart_y) * offset_y + subpart_h - 1) * img_w * components +
(subpart_x * offset_x + subpart_w - 1) * components]);
}
}
else {
glTexSubImage2D(GL_TEXTURE_2D,
0,
0,
0,
subpart_w,
subpart_h,
format,
GL_UNSIGNED_BYTE,
&uc_rect[((size_t)subpart_y) * offset_y * img_w * components +
subpart_x * offset_x * components]);
if (subpart_w < tex_w) {
glTexSubImage2D(GL_TEXTURE_2D,
0,
subpart_w,
0,
1,
subpart_h,
format,
GL_UNSIGNED_BYTE,
&uc_rect[((size_t)subpart_y) * offset_y * img_w * components +
(subpart_x * offset_x + subpart_w - 1) * components]);
}
if (subpart_h < tex_h) {
glTexSubImage2D(
GL_TEXTURE_2D,
0,
0,
subpart_h,
subpart_w,
1,
format,
GL_UNSIGNED_BYTE,
&uc_rect[(((size_t)subpart_y) * offset_y + subpart_h - 1) * img_w * components +
subpart_x * offset_x * components]);
}
if (subpart_w < tex_w && subpart_h < tex_h) {
glTexSubImage2D(
GL_TEXTURE_2D,
0,
subpart_w,
subpart_h,
1,
1,
format,
GL_UNSIGNED_BYTE,
&uc_rect[(((size_t)subpart_y) * offset_y + subpart_h - 1) * img_w * components +
(subpart_x * offset_x + subpart_w - 1) * components]);
}
}
immBegin(GPU_PRIM_TRI_FAN, 4);
immAttr2f(texco, (float)(0 + offset_left) / tex_w, (float)(0 + offset_bot) / tex_h);
immVertex2f(pos, rast_x + (float)offset_left * xzoom, rast_y + (float)offset_bot * yzoom);
immAttr2f(texco, (float)(subpart_w - offset_right) / tex_w, (float)(0 + offset_bot) / tex_h);
immVertex2f(pos,
rast_x + (float)(subpart_w - offset_right) * xzoom * scaleX,
rast_y + (float)offset_bot * yzoom);
immAttr2f(texco,
(float)(subpart_w - offset_right) / tex_w,
(float)(subpart_h - offset_top) / tex_h);
immVertex2f(pos,
rast_x + (float)(subpart_w - offset_right) * xzoom * scaleX,
rast_y + (float)(subpart_h - offset_top) * yzoom * scaleY);
immAttr2f(texco, (float)(0 + offset_left) / tex_w, (float)(subpart_h - offset_top) / tex_h);
immVertex2f(pos,
rast_x + (float)offset_left * xzoom,
rast_y + (float)(subpart_h - offset_top) * yzoom * scaleY);
immEnd();
/* NOTE: Weirdly enough this is only required on macOS. Without this there is some sort of
* bleeding of data is happening from tiles which are drawn later on.
* This doesn't seem to be too slow,
* but still would be nice to have fast and nice solution. */
#ifdef __APPLE__
GPU_flush();
#endif
}
}
if (state->do_shader_unbind) {
immUnbindProgram();
}
glBindTexture(GL_TEXTURE_2D, 0);
glPixelStorei(GL_UNPACK_ROW_LENGTH, unpack_row_length);
}
void immDrawPixelsTexScaled(IMMDrawPixelsTexState *state,
float x,
float y,
int img_w,
int img_h,
int format,
int type,
int zoomfilter,
void *rect,
float scaleX,
float scaleY,
float xzoom,
float yzoom,
float color[4])
{
immDrawPixelsTexScaled_clipping(state,
x,
y,
img_w,
img_h,
format,
type,
zoomfilter,
rect,
scaleX,
scaleY,
0.0f,
0.0f,
0.0f,
0.0f,
xzoom,
yzoom,
color);
}
void immDrawPixelsTex(IMMDrawPixelsTexState *state,
float x,
float y,
int img_w,
int img_h,
int format,
int type,
int zoomfilter,
void *rect,
float xzoom,
float yzoom,
float color[4])
{
immDrawPixelsTexScaled_clipping(state,
x,
y,
img_w,
img_h,
format,
type,
zoomfilter,
rect,
1.0f,
1.0f,
0.0f,
0.0f,
0.0f,
0.0f,
xzoom,
yzoom,
color);
}
void immDrawPixelsTex_clipping(IMMDrawPixelsTexState *state,
float x,
float y,
int img_w,
int img_h,
int format,
int type,
int zoomfilter,
void *rect,
float clip_min_x,
float clip_min_y,
float clip_max_x,
float clip_max_y,
float xzoom,
float yzoom,
float color[4])
{
immDrawPixelsTexScaled_clipping(state,
x,
y,
img_w,
img_h,
format,
type,
zoomfilter,
rect,
1.0f,
1.0f,
clip_min_x,
clip_min_y,
clip_max_x,
clip_max_y,
xzoom,
yzoom,
color);
}
/* *************** glPolygonOffset hack ************* */
float bglPolygonOffsetCalc(const float winmat[16], float viewdist, float dist)
{
/* Seems like we have a factor of 2 more offset than 2.79 for some reason. Correct for this. */
dist *= 0.5f;
if (winmat[15] > 0.5f) {
#if 1
return 0.00001f * dist * viewdist; // ortho tweaking
#else
static float depth_fac = 0.0f;
if (depth_fac == 0.0f) {
int depthbits;
glGetIntegerv(GL_DEPTH_BITS, &depthbits);
depth_fac = 1.0f / (float)((1 << depthbits) - 1);
}
offs = (-1.0 / winmat[10]) * dist * depth_fac;
UNUSED_VARS(viewdist);
#endif
}
else {
/* This adjustment effectively results in reducing the Z value by 0.25%.
*
* winmat[14] actually evaluates to `-2 * far * near / (far - near)`,
* is very close to -0.2 with default clip range,
* and is used as the coefficient multiplied by `w / z`,
* thus controlling the z dependent part of the depth value.
*/
return winmat[14] * -0.0025f * dist;
}
}
/**
* \note \a viewdist is only for ortho at the moment.
*/
void bglPolygonOffset(float viewdist, float dist)
{
static float winmat[16], offset = 0.0f;
if (dist != 0.0f) {
// glEnable(GL_POLYGON_OFFSET_FILL);
// glPolygonOffset(-1.0, -1.0);
/* hack below is to mimic polygon offset */
GPU_matrix_projection_get(winmat);
/* dist is from camera to center point */
float offs = bglPolygonOffsetCalc(winmat, viewdist, dist);
winmat[14] -= offs;
offset += offs;
}
else {
winmat[14] += offset;
offset = 0.0;
}
GPU_matrix_projection_set(winmat);
}
/* **** Color management helper functions for GLSL display/transform ***** */
/* Draw given image buffer on a screen using GLSL for display transform */
void ED_draw_imbuf_clipping(ImBuf *ibuf,
float x,
float y,
int zoomfilter,
ColorManagedViewSettings *view_settings,
ColorManagedDisplaySettings *display_settings,
float clip_min_x,
float clip_min_y,
float clip_max_x,
float clip_max_y,
float zoom_x,
float zoom_y)
{
bool force_fallback = false;
bool need_fallback = true;
/* Early out */
if (ibuf->rect == NULL && ibuf->rect_float == NULL) {
return;
}
/* Single channel images could not be transformed using GLSL yet */
force_fallback |= ibuf->channels == 1;
/* If user decided not to use GLSL, fallback to glaDrawPixelsAuto */
force_fallback |= (ED_draw_imbuf_method(ibuf) != IMAGE_DRAW_METHOD_GLSL);
/* Try to draw buffer using GLSL display transform */
if (force_fallback == false) {
int ok;
IMMDrawPixelsTexState state = {0};
/* We want GLSL state to be fully handled by OCIO. */
state.do_shader_unbind = false;
immDrawPixelsTexSetupAttributes(&state);
if (ibuf->rect_float) {
if (ibuf->float_colorspace) {
ok = IMB_colormanagement_setup_glsl_draw_from_space(
view_settings, display_settings, ibuf->float_colorspace, ibuf->dither, true, false);
}
else {
ok = IMB_colormanagement_setup_glsl_draw(
view_settings, display_settings, ibuf->dither, true);
}
}
else {
ok = IMB_colormanagement_setup_glsl_draw_from_space(
view_settings, display_settings, ibuf->rect_colorspace, ibuf->dither, false, false);
}
if (ok) {
if (ibuf->rect_float) {
int format = 0;
if (ibuf->channels == 3) {
format = GL_RGB;
}
else if (ibuf->channels == 4) {
format = GL_RGBA;
}
else {
BLI_assert(!"Incompatible number of channels for GLSL display");
}
if (format != 0) {
immDrawPixelsTex_clipping(&state,
x,
y,
ibuf->x,
ibuf->y,
format,
GL_FLOAT,
zoomfilter,
ibuf->rect_float,
clip_min_x,
clip_min_y,
clip_max_x,
clip_max_y,
zoom_x,
zoom_y,
NULL);
}
}
else if (ibuf->rect) {
/* ibuf->rect is always RGBA */
immDrawPixelsTex_clipping(&state,
x,
y,
ibuf->x,
ibuf->y,
GL_RGBA,
GL_UNSIGNED_BYTE,
zoomfilter,
ibuf->rect,
clip_min_x,
clip_min_y,
clip_max_x,
clip_max_y,
zoom_x,
zoom_y,
NULL);
}
IMB_colormanagement_finish_glsl_draw();
need_fallback = false;
}
}
/* In case GLSL failed or not usable, fallback to glaDrawPixelsAuto */
if (need_fallback) {
unsigned char *display_buffer;
void *cache_handle;
display_buffer = IMB_display_buffer_acquire(
ibuf, view_settings, display_settings, &cache_handle);
if (display_buffer) {
IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
immDrawPixelsTex_clipping(&state,
x,
y,
ibuf->x,
ibuf->y,
GL_RGBA,
GL_UNSIGNED_BYTE,
zoomfilter,
display_buffer,
clip_min_x,
clip_min_y,
clip_max_x,
clip_max_y,
zoom_x,
zoom_y,
NULL);
}
IMB_display_buffer_release(cache_handle);
}
}
void ED_draw_imbuf(ImBuf *ibuf,
float x,
float y,
int zoomfilter,
ColorManagedViewSettings *view_settings,
ColorManagedDisplaySettings *display_settings,
float zoom_x,
float zoom_y)
{
ED_draw_imbuf_clipping(ibuf,
x,
y,
zoomfilter,
view_settings,
display_settings,
0.0f,
0.0f,
0.0f,
0.0f,
zoom_x,
zoom_y);
}
void ED_draw_imbuf_ctx_clipping(const bContext *C,
ImBuf *ibuf,
float x,
float y,
int zoomfilter,
float clip_min_x,
float clip_min_y,
float clip_max_x,
float clip_max_y,
float zoom_x,
float zoom_y)
{
ColorManagedViewSettings *view_settings;
ColorManagedDisplaySettings *display_settings;
IMB_colormanagement_display_settings_from_ctx(C, &view_settings, &display_settings);
ED_draw_imbuf_clipping(ibuf,
x,
y,
zoomfilter,
view_settings,
display_settings,
clip_min_x,
clip_min_y,
clip_max_x,
clip_max_y,
zoom_x,
zoom_y);
}
void ED_draw_imbuf_ctx(
const bContext *C, ImBuf *ibuf, float x, float y, int zoomfilter, float zoom_x, float zoom_y)
{
ED_draw_imbuf_ctx_clipping(C, ibuf, x, y, zoomfilter, 0.0f, 0.0f, 0.0f, 0.0f, zoom_x, zoom_y);
}
int ED_draw_imbuf_method(ImBuf *ibuf)
{
if (U.image_draw_method == IMAGE_DRAW_METHOD_AUTO) {
/* Use faster GLSL when CPU to GPU transfer is unlikely to be a bottleneck,
* otherwise do color management on CPU side. */
const size_t threshold = 2048 * 2048 * 4 * sizeof(float);
const size_t data_size = (ibuf->rect_float) ? sizeof(float) : sizeof(uchar);
const size_t size = ibuf->x * ibuf->y * ibuf->channels * data_size;
return (size > threshold) ? IMAGE_DRAW_METHOD_2DTEXTURE : IMAGE_DRAW_METHOD_GLSL;
}
else {
return U.image_draw_method;
}
}
/* don't move to GPU_immediate_util.h because this uses user-prefs
* and isn't very low level */
void immDrawBorderCorners(unsigned int pos, const rcti *border, float zoomx, float zoomy)
{
float delta_x = 4.0f * UI_DPI_FAC / zoomx;
float delta_y = 4.0f * UI_DPI_FAC / zoomy;
delta_x = min_ff(delta_x, border->xmax - border->xmin);
delta_y = min_ff(delta_y, border->ymax - border->ymin);
/* left bottom corner */
immBegin(GPU_PRIM_LINE_STRIP, 3);
immVertex2f(pos, border->xmin, border->ymin + delta_y);
immVertex2f(pos, border->xmin, border->ymin);
immVertex2f(pos, border->xmin + delta_x, border->ymin);
immEnd();
/* left top corner */
immBegin(GPU_PRIM_LINE_STRIP, 3);
immVertex2f(pos, border->xmin, border->ymax - delta_y);
immVertex2f(pos, border->xmin, border->ymax);
immVertex2f(pos, border->xmin + delta_x, border->ymax);
immEnd();
/* right bottom corner */
immBegin(GPU_PRIM_LINE_STRIP, 3);
immVertex2f(pos, border->xmax - delta_x, border->ymin);
immVertex2f(pos, border->xmax, border->ymin);
immVertex2f(pos, border->xmax, border->ymin + delta_y);
immEnd();
/* right top corner */
immBegin(GPU_PRIM_LINE_STRIP, 3);
immVertex2f(pos, border->xmax - delta_x, border->ymax);
immVertex2f(pos, border->xmax, border->ymax);
immVertex2f(pos, border->xmax, border->ymax - delta_y);
immEnd();
}
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