[Bf-blender-cvs] [0961ce04cbf] master: Fix T78124 Overlay: Image: Camera background image transparency not working
Clément Foucault
noreply at git.blender.org
Fri Jul 3 01:48:53 CEST 2020
Commit: 0961ce04cbf0e7b46020d3e0a594c5d429a46c65
Author: Clément Foucault
Date: Fri Jul 3 01:46:45 2020 +0200
Branches: master
https://developer.blender.org/rB0961ce04cbf0e7b46020d3e0a594c5d429a46c65
Fix T78124 Overlay: Image: Camera background image transparency not working
This changes to premultiplied blending for all cases and put the premult
in the shader.
===================================================================
M source/blender/draw/engines/overlay/overlay_image.c
M source/blender/draw/engines/overlay/shaders/image_frag.glsl
===================================================================
diff --git a/source/blender/draw/engines/overlay/overlay_image.c b/source/blender/draw/engines/overlay/overlay_image.c
index be3510967b6..a754f7cbd49 100644
--- a/source/blender/draw/engines/overlay/overlay_image.c
+++ b/source/blender/draw/engines/overlay/overlay_image.c
@@ -61,11 +61,11 @@ void OVERLAY_image_cache_init(OVERLAY_Data *vedata)
state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS;
DRW_PASS_CREATE(psl->image_empties_ps, state | pd->clipping_state);
- state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_BLEND_ALPHA;
+ state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_BLEND_ALPHA_PREMUL;
DRW_PASS_CREATE(psl->image_empties_back_ps, state | pd->clipping_state);
DRW_PASS_CREATE(psl->image_empties_blend_ps, state | pd->clipping_state);
- state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA;
+ state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA_PREMUL;
DRW_PASS_CREATE(psl->image_empties_front_ps, state);
DRW_PASS_CREATE(psl->image_foreground_ps, state);
}
@@ -342,7 +342,7 @@ void OVERLAY_image_camera_cache_populate(OVERLAY_Data *vedata, Object *ob)
mul_m4_m4m4(mat, modelmat, mat);
const bool is_foreground = (bgpic->flag & CAM_BGIMG_FLAG_FOREGROUND) != 0;
- float color_premult_alpha[4] = {bgpic->alpha, bgpic->alpha, bgpic->alpha, bgpic->alpha};
+ float color_premult_alpha[4] = {1.0f, 1.0f, 1.0f, bgpic->alpha};
DRWPass *pass = is_foreground ? psl->image_foreground_ps : psl->image_background_ps;
diff --git a/source/blender/draw/engines/overlay/shaders/image_frag.glsl b/source/blender/draw/engines/overlay/shaders/image_frag.glsl
index 298ba1e27ed..4d37f1599a3 100644
--- a/source/blender/draw/engines/overlay/shaders/image_frag.glsl
+++ b/source/blender/draw/engines/overlay/shaders/image_frag.glsl
@@ -26,4 +26,7 @@ void main()
fragColor.a = 1.0;
}
}
+
+ /* Pre-multiplied blending. */
+ fragColor.rgb *= fragColor.a;
}
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