[[framebuffer-blend-advanced]] === Advanced Blend Operations The _advanced blend operations_ are those listed in tables <>, <>, and <>. [open,refpage='VkPipelineColorBlendAdvancedStateCreateInfoEXT',desc='Structure specifying parameters that affect advanced blend operations',type='structs'] -- If the pname:pNext chain of slink:VkPipelineColorBlendStateCreateInfo includes a sname:VkPipelineColorBlendAdvancedStateCreateInfoEXT structure, then that structure includes parameters that affect advanced blend operations. The sname:VkPipelineColorBlendAdvancedStateCreateInfoEXT structure is defined as: include::../../api/structs/VkPipelineColorBlendAdvancedStateCreateInfoEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:srcPremultiplied specifies whether the source color of the blend operation is treated as premultiplied. * pname:dstPremultiplied specifies whether the destination color of the blend operation is treated as premultiplied. * pname:blendOverlap is a elink:VkBlendOverlapEXT value specifying how the source and destination sample's coverage is correlated. If this structure is not present, pname:srcPremultiplied and pname:dstPremultiplied are both considered to be ename:VK_TRUE, and pname:blendOverlap is considered to be ename:VK_BLEND_OVERLAP_UNCORRELATED_EXT. .Valid Usage **** * [[VUID-VkPipelineColorBlendAdvancedStateCreateInfoEXT-srcPremultiplied-01424]] If the <> property is not supported, pname:srcPremultiplied must: be ename:VK_TRUE * [[VUID-VkPipelineColorBlendAdvancedStateCreateInfoEXT-dstPremultiplied-01425]] If the <> property is not supported, pname:dstPremultiplied must: be ename:VK_TRUE * [[VUID-VkPipelineColorBlendAdvancedStateCreateInfoEXT-blendOverlap-01426]] If the <> property is not supported, pname:blendOverlap must: be ename:VK_BLEND_OVERLAP_UNCORRELATED_EXT **** include::../../validity/structs/VkPipelineColorBlendAdvancedStateCreateInfoEXT.txt[] -- When using one of the operations in table <> or <>, blending is performed according to the following equations: [latexmath] +++++++++++++++++++ \begin{aligned} R & = & f(R_s',R_d')*p_0(A_s,A_d) & + & Y*R_s'*p_1(A_s,A_d) & + & Z*R_d'*p_2(A_s,A_d) \\ G & = & f(G_s',G_d')*p_0(A_s,A_d) & + & Y*G_s'*p_1(A_s,A_d) & + & Z*G_d'*p_2(A_s,A_d) \\ B & = & f(B_s',B_d')*p_0(A_s,A_d) & + & Y*B_s'*p_1(A_s,A_d) & + & Z*B_d'*p_2(A_s,A_d) \\ A & = & X*p_0(A_s,A_d) & + & Y*p_1(A_s,A_d) & + & Z*p_2(A_s,A_d) \end{aligned} +++++++++++++++++++ where the function f and terms X, Y, and Z are specified in the table. The R, G, and B components of the source color used for blending are derived according to pname:srcPremultiplied. If pname:srcPremultiplied is set to ename:VK_TRUE, the fragment color components are considered to have been premultiplied by the A component prior to blending. The base source color [eq]#(R~s~',G~s~',B~s~')# is obtained by dividing through by the A component: [latexmath] +++++++++++++++++++ \begin{aligned} (R_s', G_s', B_s') & = \begin{cases} (0, 0, 0) & A_s = 0 \\ (\frac{R_s}{A_s}, \frac{G_s}{A_s}, \frac{B_s}{A_s}) & \text{otherwise} \end{cases} \end{aligned} +++++++++++++++++++ If pname:srcPremultiplied is ename:VK_FALSE, the fragment color components are used as the base color: [latexmath] +++++++++++++++++++ \begin{aligned} (R_s', G_s', B_s') & = (R_s, G_s, B_s) \end{aligned} +++++++++++++++++++ The R, G, and B components of the destination color used for blending are derived according to pname:dstPremultiplied. If pname:dstPremultiplied is set to ename:VK_TRUE, the destination components are considered to have been premultiplied by the A component prior to blending. The base destination color [eq]#(R~d~',G~d~',B~d~')# is obtained by dividing through by the A component: [latexmath] +++++++++++++++++++ \begin{aligned} (R_d', G_d', B_d') & = \begin{cases} (0, 0, 0) & A_d = 0 \\ (\frac{R_d}{A_d}, \frac{G_d}{A_d}, \frac{B_d}{A_d}) & \text{otherwise} \end{cases} \end{aligned} +++++++++++++++++++ If pname:dstPremultiplied is ename:VK_FALSE, the destination color components are used as the base color: [latexmath] +++++++++++++++++++ \begin{aligned} (R_d', G_d', B_d') & = (R_d, G_d, B_d) \end{aligned} +++++++++++++++++++ [open,refpage='VkBlendOverlapEXT',desc='Enumerant specifying the blend overlap parameter',type='enums'] -- When blending using advanced blend operations, we expect that the R, G, and B components of premultiplied source and destination color inputs be stored as the product of non-premultiplied R, G, and B component values and the A component of the color. If any R, G, or B component of a premultiplied input color is non-zero and the A component is zero, the color is considered ill-formed, and the corresponding component of the blend result is undefined:. The weighting functions [eq]#p~0~#, [eq]#p~1~#, and [eq]#p~2~# are defined in table <>. In these functions, the A components of the source and destination colors are taken to indicate the portion of the pixel covered by the fragment (source) and the fragments previously accumulated in the pixel (destination). The functions [eq]#p~0~#, [eq]#p~1~#, and [eq]#p~2~# approximate the relative portion of the pixel covered by the intersection of the source and destination, covered only by the source, and covered only by the destination, respectively. Possible values of slink:VkPipelineColorBlendAdvancedStateCreateInfoEXT::pname:blendOverlap, specifying the blend overlap functions, are: include::../../api/enums/VkBlendOverlapEXT.txt[] * ename:VK_BLEND_OVERLAP_UNCORRELATED_EXT specifies that there is no correlation between the source and destination coverage. * ename:VK_BLEND_OVERLAP_CONJOINT_EXT specifies that the source and destination coverage are considered to have maximal overlap. * ename:VK_BLEND_OVERLAP_DISJOINT_EXT specifies that the source and destination coverage are considered to have minimal overlap. [[framebuffer-blend-advanced-overlap-modes]] .Advanced Blend Overlap Modes [width="80%",options="header"] |==== | Overlap Mode | Weighting Equations | ename:VK_BLEND_OVERLAP_UNCORRELATED_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} p_0(A_s,A_d) & = A_sA_d \\ p_1(A_s,A_d) & = A_s(1-A_d) \\ p_2(A_s,A_d) & = A_d(1-A_s) \\ \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OVERLAP_CONJOINT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} p_0(A_s,A_d) & = min(A_s,A_d) \\ p_1(A_s,A_d) & = max(A_s-A_d,0) \\ p_2(A_s,A_d) & = max(A_d-A_s,0) \\ \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OVERLAP_DISJOINT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} p_0(A_s,A_d) & = max(A_s+A_d-1,0) \\ p_1(A_s,A_d) & = min(A_s,1-A_d) \\ p_2(A_s,A_d) & = min(A_d,1-A_s) \\ \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |==== -- [[framebuffer-blend-advanced-fxyz-modes]] .f/X/Y/Z Advanced Blend Operations [width="80%",options="header"] |==== | Mode | Blend Coefficients | ename:VK_BLEND_OP_ZERO_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (0,0,0) \\ f(C_s,C_d) & = 0 \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_SRC_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,0) \\ f(C_s,C_d) & = C_s \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_DST_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,0,1) \\ f(C_s,C_d) & = C_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_SRC_OVER_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = C_s \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_DST_OVER_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = C_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_SRC_IN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,0,0) \\ f(C_s,C_d) & = C_s \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_DST_IN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,0,0) \\ f(C_s,C_d) & = C_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_SRC_OUT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (0,1,0) \\ f(C_s,C_d) & = 0 \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_DST_OUT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (0,0,1) \\ f(C_s,C_d) & = 0 \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_SRC_ATOP_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,0,1) \\ f(C_s,C_d) & = C_s \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_DST_ATOP_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,0) \\ f(C_s,C_d) & = C_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_XOR_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (0,1,1) \\ f(C_s,C_d) & = 0 \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_MULTIPLY_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = C_sC_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_SCREEN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = C_s+C_d-C_sC_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_OVERLAY_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 2 C_sC_d & C_d \leq 0.5 \\ 1-2 (1-C_s)(1-C_d) & \text{otherwise} \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_DARKEN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = min(C_s,C_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_LIGHTEN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = max(C_s,C_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_COLORDODGE_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 0 & C_d \leq 0 \\ min(1,\frac{C_d}{1-C_s}) & C_d \gt 0 \text{ and } C_s \lt 1 \\ 1 & C_d \gt 0 \text{ and } C_s \geq 1 \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_COLORBURN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 1 & C_d \geq 1 \\ 1 - min(1,\frac{1-C_d}{C_s}) & C_d \lt 1 \text{ and } C_s \gt 0 \\ 0 & C_d \lt 1 \text{ and } C_s \leq 0 \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_HARDLIGHT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 2 C_sC_d & C_s \leq 0.5 \\ 1-2 (1-C_s)(1-C_d) & \text{otherwise} \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_SOFTLIGHT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} C_d-(1-2 C_s)C_d(1-C_d) & C_s \leq 0.5 \\ C_d+(2 C_s-1)C_d((16 C_d-12)C_d+3) & C_s \gt 0.5 \text{ and } C_d \leq 0.25 \\ C_d+(2 C_s-1)(\sqrt{C_d}-C_d) & C_s \gt 0.5 \text{ and } C_d \gt 0.25 \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_DIFFERENCE_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \lvert C_d-C_s \rvert \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_EXCLUSION_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = C_s+C_d-2C_sC_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_INVERT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,0,1) \\ f(C_s,C_d) & = 1-C_d \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_INVERT_RGB_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,0,1) \\ f(C_s,C_d) & = C_s(1-C_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_LINEARDODGE_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} C_s+C_d & C_s+C_d \leq 1 \\ 1 & \text{otherwise} \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_LINEARBURN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} C_s+C_d-1 & C_s+C_d \gt 1 \\ 0 & \text{otherwise} \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_VIVIDLIGHT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 1-min(1,\frac{1-C_d}{2C_s}) & 0 \lt C_s \lt 0.5 \\ 0 & C_s \leq 0 \\ min(1,\frac{C_d}{2(1-C_s)}) & 0.5 \leq C_s \lt 1 \\ 1 & C_s \geq 1 \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_LINEARLIGHT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 1 & 2C_s+C_d \gt 2 \\ 2C_s+C_d-1 & 1 \lt 2C_s+C_d \leq 2 \\ 0 & 2C_s+C_d \leq 1 \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_PINLIGHT_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 0 & 2C_s-1 \gt C_d \text{ and } C_s \lt 0.5 \\ 2C_s-1 & 2C_s-1 \gt C_d \text{ and } C_s \geq 0.5 \\ 2C_s & 2C_s-1 \leq C_d \text{ and } C_s \lt 0.5C_d \\ C_d & 2C_s-1 \leq C_d \text{ and } C_s \geq 0.5C_d \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_HARDMIX_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = \begin{cases} 0 & C_s+C_d \lt 1 \\ 1 & \text{otherwise} \end{cases} \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |==== When using one of the HSL blend operations in table <> as the blend operation, the RGB color components produced by the function f are effectively obtained by converting both the non-premultiplied source and destination colors to the HSL (hue, saturation, luminosity) color space, generating a new HSL color by selecting H, S, and L components from the source or destination according to the blend operation, and then converting the result back to RGB. In the equations below, a blended RGB color is produced according to the following pseudocode: [source,c++] ---------------------------------------- float minv3(vec3 c) { return min(min(c.r, c.g), c.b); } float maxv3(vec3 c) { return max(max(c.r, c.g), c.b); } float lumv3(vec3 c) { return dot(c, vec3(0.30, 0.59, 0.11)); } float satv3(vec3 c) { return maxv3(c) - minv3(c); } // If any color components are outside [0,1], adjust the color to // get the components in range. vec3 ClipColor(vec3 color) { float lum = lumv3(color); float mincol = minv3(color); float maxcol = maxv3(color); if (mincol < 0.0) { color = lum + ((color-lum)*lum) / (lum-mincol); } if (maxcol > 1.0) { color = lum + ((color-lum)*lum) / (maxcol-lum); } return color; } // Take the base RGB color and override its luminosity // with that of the RGB color . vec3 SetLum(vec3 cbase, vec3 clum) { float lbase = lumv3(cbase); float llum = lumv3(clum); float ldiff = llum - lbase; vec3 color = cbase + vec3(ldiff); return ClipColor(color); } // Take the base RGB color and override its saturation with // that of the RGB color . The override the luminosity of the // result with that of the RGB color . vec3 SetLumSat(vec3 cbase, vec3 csat, vec3 clum) { float minbase = minv3(cbase); float sbase = satv3(cbase); float ssat = satv3(csat); vec3 color; if (sbase > 0) { // Equivalent (modulo rounding errors) to setting the // smallest (R,G,B) component to 0, the largest to , // and interpolating the "middle" component based on its // original value relative to the smallest/largest. color = (cbase - minbase) * ssat / sbase; } else { color = vec3(0.0); } return SetLum(color, clum); } ---------------------------------------- [[framebuffer-blend-advanced-hsl-modes]] .Hue-Saturation-Luminosity Advanced Blend Operations [width="80%",options="header"] |==== | Mode | Result | ename:VK_BLEND_OP_HSL_HUE_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = SetLumSat(C_s,C_d,C_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_HSL_SATURATION_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = SetLumSat(C_d,C_s,C_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_HSL_COLOR_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = SetLum(C_s,C_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_HSL_LUMINOSITY_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (X,Y,Z) & = (1,1,1) \\ f(C_s,C_d) & = SetLum(C_d,C_s) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |==== When using one of the operations in table <> as the blend operation, the source and destination colors used by these blending operations are interpreted according to pname:srcPremultiplied and pname:dstPremultiplied. The blending operations below are evaluated where the RGB source and destination color components are both considered to have been premultiplied by the corresponding A component. [latexmath] +++++++++++++++++++ \begin{aligned} (R_s', G_s', B_s') & = \begin{cases} (R_s, G_s, B_s) & \text{if srcPremultiplied is VK\_TRUE} \\ (R_sA_s, G_sA_s, B_sA_s) & \text{if srcPremultiplied is VK\_FALSE} \end{cases} \\ (R_d', G_d', B_d') & = \begin{cases} (R_d, G_d, B_d) & \text{if dstPremultiplied is VK\_TRUE} \\ (R_dA_d, G_dA_d, B_dA_d) & \text{if dstPremultiplied is VK\_FALSE} \end{cases} \end{aligned} +++++++++++++++++++ [[framebuffer-blend-advanced-additional-rgb]] .Additional RGB Blend Operations [width="80%",options="header"] |==== | Mode | Result | ename:VK_BLEND_OP_PLUS_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & R_s'+R_d', \\ & G_s'+G_d', \\ & B_s'+B_d', \\ & A_s+A_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_PLUS_CLAMPED_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & min(1,R_s'+R_d'), \\ & min(1,G_s'+G_d'), \\ & min(1,B_s'+B_d'), \\ & min(1,A_s+A_d)) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_PLUS_CLAMPED_ALPHA_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & min(min(1,A_s+A_d),R_s'+R_d'), \\ & min(min(1,A_s+A_d),G_s'+G_d'), \\ & min(min(1,A_s+A_d),B_s'+B_d'), \\ & min(1,A_s+A_d)) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_PLUS_DARKER_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & max(0,min(1,A_s+A_d)-((A_s-R_s')+(A_d-R_d'))), \\ & max(0,min(1,A_s+A_d)-((A_s-G_s')+(A_d-G_d'))), \\ & max(0,min(1,A_s+A_d)-((A_s-B_s')+(A_d-B_d'))), \\ & min(1,A_s+A_d)) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_MINUS_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & R_d'-R_s', \\ & G_d'-G_s', \\ & B_d'-B_s', \\ & A_d-A_s) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_MINUS_CLAMPED_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & max(0,R_d'-R_s'), \\ & max(0,G_d'-G_s'), \\ & max(0,B_d'-B_s'), \\ & max(0,A_d-A_s)) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_CONTRAST_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & \frac{A_d}{2} + 2(R_d'-\frac{A_d}{2})(R_s'-\frac{A_s}{2}), \\ & \frac{A_d}{2} + 2(G_d'-\frac{A_d}{2})(G_s'-\frac{A_s}{2}), \\ & \frac{A_d}{2} + 2(B_d'-\frac{A_d}{2})(B_s'-\frac{A_s}{2}), \\ & A_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_INVERT_OVG_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) = ( & A_s(1-R_d') + (1-A_s)R_d', \\ & A_s(1-G_d') + (1-A_s)G_d', \\ & A_s(1-B_d') + (1-A_s)B_d', \\ & A_s+A_d-A_sA_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_RED_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) & = (R_s', G_d', B_d', A_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_GREEN_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) & = (R_d', G_s', B_d', A_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ename:VK_BLEND_OP_BLUE_EXT a| [latexmath] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \begin{aligned} (R,G,B,A) & = (R_d', G_d', B_s', A_d) \end{aligned} ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |====