set background clear color correctly

examples/win_canvas/main.c

@@ -71,22 +71,18 @@ int main()
 					{
 						if(event.key.code == MP_KEY_LEFT)
 						{
-							printf("left\n");
 							dx-=1.1;
 						}
 						else if(event.key.code == MP_KEY_RIGHT)
 						{
-							printf("right\n");
 							dx+=1.1;
 						}
 						else if(event.key.code == MP_KEY_UP)
 						{
-							printf("up\n");
 							dy+=1.1;
 						}
 						else if(event.key.code == MP_KEY_DOWN)
 						{
-							printf("down\n");
 							dy-=1.1;
 						}
 					}
@@ -100,7 +96,7 @@ int main()
 		mg_surface_prepare(surface);
 
 			// background
-			mg_set_color_rgba(1, 0, 1, 1);
+			mg_set_color_rgba(0, 1, 1, 1);
 			mg_clear();
 
 			// head

src/gles_canvas.c

@@ -125,12 +125,15 @@ void mg_gles_canvas_draw_buffers(mg_canvas_backend* interface, u32 vertexCount,
 	glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->indexBuffer);
 	glUnmapBuffer(GL_SHADER_STORAGE_BUFFER);
 
-
 	glUseProgram(backend->program);
+
 	glBindBuffer(GL_ARRAY_BUFFER, backend->dummyVertexBuffer);
 	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, backend->vertexBuffer);
 	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, backend->indexBuffer);
+
 	glUniform1i(0, indexCount);
+	glUniform4f(1, clearColor.r, clearColor.g, clearColor.b, clearColor.a);
+
 	glDrawArrays(GL_TRIANGLES, 0, 6);
 
 	mg_gles_canvas_update_vertex_layout(backend);

src/gles_canvas_shaders.h

@@ -34,6 +34,8 @@ const char* gles_canvas_fragment =
 "} indexBuffer ;\n"
 "\n"
 "layout(location = 0) uniform int indexCount;\n"
+"layout(location = 1) uniform vec4 clearColor;\n"
+"\n"
 "layout(location = 0) out vec4 fragColor;\n"
 "\n"
 "bool is_top_left(ivec2 a, ivec2 b)\n"
@@ -51,8 +53,8 @@ const char* gles_canvas_fragment =
 "{\n"
 "	float subPixelFactor = 16.;\n"
 "\n"
-"    vec4 pixelColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
-"    vec4 currentColor = vec4(0., 0., 0., 1.0);\n"
+"    vec4 pixelColor = clearColor;\n"
+"    vec4 currentColor = clearColor;\n"
 "\n"
 "	ivec2 samplePoint = ivec2(gl_FragCoord.xy * subPixelFactor + vec2(0.5, 0.5));\n"
 "\n"

src/gles_canvas_shaders/gles_canvas_fragment.glsl

@@ -21,6 +21,8 @@ layout(binding = 1) buffer indexBufferSSBO {
 } indexBuffer ;
 
 layout(location = 0) uniform int indexCount;
+layout(location = 1) uniform vec4 clearColor;
+
 layout(location = 0) out vec4 fragColor;
 
 bool is_top_left(ivec2 a, ivec2 b)
@@ -38,8 +40,8 @@ void main()
 {
 	float subPixelFactor = 16.;
 
-    vec4 pixelColor = vec4(0.0, 1.0, 0.0, 1.0);
-    vec4 currentColor = vec4(0., 0., 0., 1.0);
+    vec4 pixelColor = clearColor;
+    vec4 currentColor = clearColor;
 
 	ivec2 samplePoint = ivec2(gl_FragCoord.xy * subPixelFactor + vec2(0.5, 0.5));
 

todo.txt

@@ -22,12 +22,14 @@
 		-> convert verts pos to fixed point
 		-> do orient2d in fixed point
 	[!] Check precision/possible overflow when using barycentric coords
-
-	[>>] Investigate cubics flipping when curves are disabled
-	[>>] Investigate bad curve splitting on the right?
+	[!] Avoid first useless (degenerate) triangle on every path
+	[x] Set backround clear color
 	[ ] Multi-sampling
+	[ ] Assess perf
+		[ ] Tiling
+		[ ] Precomputing triangle edges/biases?
 
-	[>] Avoid first useless (degenerate) triangle on every path
+	[ ] Little test drawing app
 
 [ ] Implement surfaces with child windows on win32
 	[/] Maybe implement compositing directly in d3d and opengl compat extension...