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image_shader.cpp
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image_shader.cpp
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/*
* Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
*
* This file is part of CasparCG (www.casparcg.com).
*
* CasparCG 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 3 of the License, or
* (at your option) any later version.
*
* CasparCG 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 CasparCG. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Robert Nagy, ronag89@gmail.com
*/
#include "image_shader.h"
#include "../util/device.h"
#include "../util/shader.h"
#include "blending_glsl.h"
#include <GL/glew.h>
#include <common/env.h>
#include <common/gl/gl_check.h>
namespace caspar { namespace accelerator { namespace ogl {
std::weak_ptr<shader> g_shader;
std::mutex g_shader_mutex;
std::string get_blend_color_func()
{
return
get_adjustement_glsl()
+
get_blend_glsl()
+
R"shader(
vec3 get_blend_color(vec3 back, vec3 fore)
{
switch(blend_mode)
{
case 0: return BlendNormal(back, fore);
case 1: return BlendLighten(back, fore);
case 2: return BlendDarken(back, fore);
case 3: return BlendMultiply(back, fore);
case 4: return BlendAverage(back, fore);
case 5: return BlendAdd(back, fore);
case 6: return BlendSubstract(back, fore);
case 7: return BlendDifference(back, fore);
case 8: return BlendNegation(back, fore);
case 9: return BlendExclusion(back, fore);
case 10: return BlendScreen(back, fore);
case 11: return BlendOverlay(back, fore);
// case 12: return BlendSoftLight(back, fore);
case 13: return BlendHardLight(back, fore);
case 14: return BlendColorDodge(back, fore);
case 15: return BlendColorBurn(back, fore);
case 16: return BlendLinearDodge(back, fore);
case 17: return BlendLinearBurn(back, fore);
case 18: return BlendLinearLight(back, fore);
case 19: return BlendVividLight(back, fore);
case 20: return BlendPinLight(back, fore);
case 21: return BlendHardMix(back, fore);
case 22: return BlendReflect(back, fore);
case 23: return BlendGlow(back, fore);
case 24: return BlendPhoenix(back, fore);
case 25: return BlendHue(back, fore);
case 26: return BlendSaturation(back, fore);
case 27: return BlendColor(back, fore);
case 28: return BlendLuminosity(back, fore);
}
return BlendNormal(back, fore);
}
vec4 blend(vec4 fore)
{
vec4 back = texture(background, TexCoord2.st).bgra;
if(blend_mode != 0)
fore.rgb = get_blend_color(back.rgb/(back.a+0.0000001), fore.rgb/(fore.a+0.0000001))*fore.a;
switch(keyer)
{
case 1: return fore + back; // additive
default: return fore + (1.0-fore.a)*back; // linear
}
}
)shader";
}
std::string get_chroma_func()
{
return
get_chroma_glsl()
+
R"shader(
vec4 chroma_key(vec4 c)
{
return ChromaOnCustomColor(c.bgra).bgra;
}
)shader";
}
std::string get_vertex()
{
return R"shader(
#version 450
in vec4 TexCoordIn;
in vec2 Position;
out vec4 TexCoord;
out vec4 TexCoord2;
void main()
{
TexCoord = TexCoordIn;
vec4 pos = vec4(Position, 0, 1);
TexCoord2 = vec4(pos.xy, 0.0, 0.0);
pos.x = pos.x*2.0 - 1.0;
pos.y = pos.y*2.0 - 1.0;
gl_Position = pos;
}
)shader";
}
std::string get_fragment()
{
return R"shader(
#version 450
in vec4 TexCoord;
in vec4 TexCoord2;
out vec4 fragColor;
uniform sampler2D background;
uniform sampler2D plane[4];
uniform sampler2D local_key;
uniform sampler2D layer_key;
uniform bool is_hd;
uniform bool has_local_key;
uniform bool has_layer_key;
uniform int blend_mode;
uniform int keyer;
uniform int pixel_format;
uniform float opacity;
uniform bool levels;
uniform float min_input;
uniform float max_input;
uniform float gamma;
uniform float min_output;
uniform float max_output;
uniform bool csb;
uniform float brt;
uniform float sat;
uniform float con;
uniform bool chroma;
uniform bool chroma_show_mask;
uniform float chroma_target_hue;
uniform float chroma_hue_width;
uniform float chroma_min_saturation;
uniform float chroma_min_brightness;
uniform float chroma_softness;
uniform float chroma_spill_suppress;
uniform float chroma_spill_suppress_saturation;
)shader"
+
get_blend_color_func()
+
get_chroma_func()
+
R"shader(
vec4 cubic(float v){
vec4 n = vec4(1.0, 2.0, 3.0, 4.0) - v;
vec4 s = n * n * n;
float x = s.x;
float y = s.y - 4.0 * s.x;
float z = s.z - 4.0 * s.y + 6.0 * s.x;
float w = 6.0 - x - y - z;
return vec4(x, y, z, w) * (1.0/6.0);
}
vec4 textureBicubic(sampler2D sampler, vec2 texCoords) {
vec2 texSize = textureSize(sampler, 0);
vec2 invTexSize = 1.0 / texSize;
texCoords = texCoords * texSize - 0.5;
vec2 fxy = fract(texCoords);
texCoords -= fxy;
vec4 xcubic = cubic(fxy.x);
vec4 ycubic = cubic(fxy.y);
vec4 c = texCoords.xxyy + vec2 (-0.5, +1.5).xyxy;
vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);
vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;
offset *= invTexSize.xxyy;
vec4 sample0 = texture(sampler, offset.xz);
vec4 sample1 = texture(sampler, offset.yz);
vec4 sample2 = texture(sampler, offset.xw);
vec4 sample3 = texture(sampler, offset.yw);
float sx = s.x / (s.x + s.y);
float sy = s.z / (s.z + s.w);
return mix(mix(sample3, sample2, sx), mix(sample1, sample0, sx), sy);
}
vec4 ycbcra_to_rgba_sd(float Y, float Cb, float Cr, float A)
{
vec4 rgba;
rgba.b = (1.164*(Y*255 - 16) + 1.596*(Cr*255 - 128))/255;
rgba.g = (1.164*(Y*255 - 16) - 0.813*(Cr*255 - 128) - 0.391*(Cb*255 - 128))/255;
rgba.r = (1.164*(Y*255 - 16) + 2.018*(Cb*255 - 128))/255;
rgba.a = A;
return rgba;
}
vec4 ycbcra_to_rgba_hd(float Y, float Cb, float Cr, float A)
{
vec4 rgba;
rgba.b = (1.164*(Y*255 - 16) + 1.793*(Cr*255 - 128))/255;
rgba.g = (1.164*(Y*255 - 16) - 0.534*(Cr*255 - 128) - 0.213*(Cb*255 - 128))/255;
rgba.r = (1.164*(Y*255 - 16) + 2.115*(Cb*255 - 128))/255;
rgba.a = A;
return rgba;
}
vec4 ycbcra_to_rgba(float y, float cb, float cr, float a)
{
if(is_hd)
return ycbcra_to_rgba_hd(y, cb, cr, a);
else
return ycbcra_to_rgba_sd(y, cb, cr, a);
}
vec4 get_sample(sampler2D sampler, vec2 coords)
{
return textureBicubic(sampler, coords);
}
vec4 get_rgba_color()
{
switch(pixel_format)
{
case 0: //gray
return vec4(get_sample(plane[0], TexCoord.st / TexCoord.q).rrr, 1.0);
case 1: //bgra,
return get_sample(plane[0], TexCoord.st / TexCoord.q).bgra;
case 2: //rgba,
return get_sample(plane[0], TexCoord.st / TexCoord.q).rgba;
case 3: //argb,
return get_sample(plane[0], TexCoord.st / TexCoord.q).argb;
case 4: //abgr,
return get_sample(plane[0], TexCoord.st / TexCoord.q).gbar;
case 5: //ycbcr,
{
float y = get_sample(plane[0], TexCoord.st / TexCoord.q).r;
float cb = get_sample(plane[1], TexCoord.st / TexCoord.q).r;
float cr = get_sample(plane[2], TexCoord.st / TexCoord.q).r;
return ycbcra_to_rgba(y, cb, cr, 1.0);
}
case 6: //ycbcra
{
float y = get_sample(plane[0], TexCoord.st / TexCoord.q).r;
float cb = get_sample(plane[1], TexCoord.st / TexCoord.q).r;
float cr = get_sample(plane[2], TexCoord.st / TexCoord.q).r;
float a = get_sample(plane[3], TexCoord.st / TexCoord.q).r;
return ycbcra_to_rgba(y, cb, cr, a);
}
case 7: //luma
{
vec3 y3 = get_sample(plane[0], TexCoord.st / TexCoord.q).rrr;
return vec4((y3-0.065)/0.859, 1.0);
}
case 8: //bgr,
return vec4(get_sample(plane[0], TexCoord.st / TexCoord.q).bgr, 1.0);
case 9: //rgb,
return vec4(get_sample(plane[0], TexCoord.st / TexCoord.q).rgb, 1.0);
}
return vec4(0.0, 0.0, 0.0, 0.0);
}
void main()
{
vec4 color = get_rgba_color();
if (chroma)
color = chroma_key(color);
if(levels)
color.rgb = LevelsControl(color.rgb, min_input, gamma, max_input, min_output, max_output);
if(csb)
color.rgb = ContrastSaturationBrightness(color, brt, sat, con);
if(has_local_key)
color *= texture(local_key, TexCoord2.st).r;
if(has_layer_key)
color *= texture(layer_key, TexCoord2.st).r;
color *= opacity;
if (blend_mode >= 0)
color = blend(color);
fragColor = color.bgra;
}
)shader";
}
std::shared_ptr<shader> get_image_shader(const spl::shared_ptr<device>& ogl)
{
std::lock_guard<std::mutex> lock(g_shader_mutex);
auto existing_shader = g_shader.lock();
if (existing_shader) {
return existing_shader;
}
// The deleter is alive until the weak pointer is destroyed, so we have
// to weakly reference ogl, to not keep it alive until atexit
std::weak_ptr<device> weak_ogl = ogl;
auto deleter = [weak_ogl](shader* p) {
auto ogl = weak_ogl.lock();
if (ogl) {
ogl->dispatch_async([=] { delete p; });
}
};
existing_shader.reset(new shader(get_vertex(), get_fragment()), deleter);
g_shader = existing_shader;
return existing_shader;
}
}}} // namespace caspar::accelerator::ogl