fpasa/alba - 9aa67fe

demo.c M +3 -3

13         +0.5, -0.5,
14         +0.5, +0.5,
15         //
16-        -1.0, 0.0,
17+        0.8, 0.0,
18         -0.5, 0.75
19     };
20     const float color[] = {
21         1.0, 0.0, 0.0, 1.0,
22         0.0, 1.0, 0.0, 1.0,
23         0.0, 0.0, 1.0, 1.0,
24-        1.0, 1.0, 1.0, 1.0,
25-        1.0, 1.0, 1.0, 1.0,
26+        1.0, 1.0, 1.0, 0.5,
27+        1.0, 1.0, 1.0, 0.2,
28     };
29     const uint32_t indices[] = {0, 1, 2, 0, 3, 4};
30     draw_triangles(window, 5, 6, vertices, color, indices);

src/window.c M +14 -1

127     };
128 
129     // Fragment shader
130+    const WGPUBlendState blend_state = {
131+        .color = {
132+            .operation = WGPUBlendOperation_Add,
133+            .srcFactor = WGPUBlendFactor_SrcAlpha,
134+            .dstFactor = WGPUBlendFactor_OneMinusSrcAlpha,
135+        },
136+        .alpha = {
137+            .operation = WGPUBlendOperation_Add,
138+            .srcFactor = WGPUBlendFactor_Zero,
139+            .dstFactor = WGPUBlendFactor_One,
140+        }
141+    };
142     WGPUColorTargetState color_state = {0};
143-    color_state.format = WGPUTextureFormat_BGRA8UnormSrgb;
144+    color_state.format = WGPUTextureFormat_BGRA8UnormSrgb; // TODO: avoid hardcoding
145+    color_state.blend = &blend_state;
146     color_state.writeMask = WGPUColorWriteMask_All;
147     WGPUFragmentState fragment_state = {0};
148     fragment_state.module = window->shaders;

Enable blending