GlClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) GlViewport(0, 0, brushTempN.width, brushTempN.height)

GlBindFramebuffer(GL_FRAMEBUFFER, brushTempN.fbo2) render bg - starts as 0 (brushBGN.tex1) MyWin.paintStroke->t->val_3 = glm::vec3(ord, 0.f) MyWin.paintStroke->s->val_3 = glm::vec3((float)Bresenham.size / 100) GlBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) įor (int i = 0 i glUseProgram2('pPaintStroke_unwashed') Ci.a = clamp(blended.a, blended.a, brushRGBA.a) Vec4 blended = texture(blended_64, v.uv) Ĭi.a = clamp(blended.a, 0.f, brushRGBA.a) Uniform vec4 brushRGBA = vec4(1.f, 1.f, 1.f. Layout(bindless_sampler, location = 0) uniform sampler2D blended_64 // blended bg + stroke #extension GL_ARB_bindless_texture : require PPaintStroke_washF full screen quad shader #version 450 core I've tried various blending modes and clamping on the opacity after blending the current stroke and the BG texture and they all more or less look like the following : In my application with a soft brush texture I always get banding on mouse move because of the fading opacity of the texture. If I click again it'll build up towards say white at 10% more because of additive blending (?). This type of paint mode I'm trying to achieve is referred to as 'wash' painting in Krita and is the normal mode in GIMP.įor example: in Photoshop I have a round brush with low hardness and brush opacity at 10% and hold down the mouse and drag the cursor around I get a uniform stroke with the texture building up to the 10% opacity except around the edges where it fades out. I've achieved 100% hard brushes but the soft brush functionality is sub par. I'm trying to implement soft brushes into my GL 4.5 application.

Soft blending brush photoshop