use immUniformColor instead of immUniform("color"

The specialized color functions are better in every way:
- faster lookup (don't have to match "color" string)
- flexible inputs (RGB with separate alpha)
- automatic alpha = 1.0 if not specified

Sort of related to T49043

source/blender/editors/gpencil/drawgpencil.c

@@ -115,7 +115,7 @@ static void gp_set_point_uniform_color(const bGPDspoint *pt, const float ink[4])
 {
 	float alpha = ink[3] * pt->strength;
 	CLAMP(alpha, GPENCIL_STRENGTH_MIN, 1.0f);
-	immUniform4f("color", ink[0], ink[1], ink[2], alpha);
+	immUniformColor3fvAlpha(ink, alpha);
 }
 
 static void gp_set_point_varying_color(const bGPDspoint *pt, const float ink[4], unsigned attrib_id)

source/blender/editors/screen/area.c

@@ -303,7 +303,7 @@ static void region_draw_azone_icon(AZone *az)
 	/* outlined circle */
 	GPU_enable_program_point_size(); /* TODO: make a fixed-size shader to avoid this */
 	immBindBuiltinProgram(GPU_SHADER_2D_POINT_UNIFORM_SIZE_UNIFORM_COLOR_OUTLINE_AA);
-	immUniform4f("color", 1.0f, 1.0f, 1.0f, 0.8f);
+	immUniformColor4f(1.0f, 1.0f, 1.0f, 0.8f);
 	immUniform4f("outlineColor", 0.2f, 0.2f, 0.2f, 0.9f);
 	immUniform1f("outlineWidth", 1.0f);
 	immUniform1f("size", 9.5f);
@@ -315,7 +315,7 @@ static void region_draw_azone_icon(AZone *az)
 
 	/* + */
 	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
-	immUniform4f("color", 0.2f, 0.2f, 0.2f, 0.9f);
+	immUniformColor4f(0.2f, 0.2f, 0.2f, 0.9f);
 	immBegin(PRIM_LINES, 4);
 	immVertex2f(pos, midx, midy - 2);
 	immVertex2f(pos, midx, midy + 3);

source/blender/editors/sculpt_paint/paint_cursor.c

@@ -675,10 +675,10 @@ static void paint_draw_tex_overlay(UnifiedPaintSettings *ups, Brush *brush,
 		immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
 
 		if (col) {
-			immUniform4f("color", 1.0f, 1.0f, 1.0f, overlay_alpha / 100.0f);
+			immUniformColor4f(1.0f, 1.0f, 1.0f, overlay_alpha * 0.01f);
 		}
 		else {
-			immUniform4f("color", UNPACK3(U.sculpt_paint_overlay_col), overlay_alpha / 100.0f);
+			immUniformColor3fvAlpha(U.sculpt_paint_overlay_col, overlay_alpha * 0.01f);
 		}
 
 		/* draw textured quad */
@@ -762,11 +762,7 @@ static void paint_draw_cursor_overlay(UnifiedPaintSettings *ups, Brush *brush,
 
 		immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
 
-		immUniform4f("color",
-		        U.sculpt_paint_overlay_col[0],
-		        U.sculpt_paint_overlay_col[1],
-		        U.sculpt_paint_overlay_col[2],
-		        brush->cursor_overlay_alpha / 100.0f);
+		immUniformColor3fvAlpha(U.sculpt_paint_overlay_col, brush->cursor_overlay_alpha * 0.01f);
 
 		/* draw textured quad */
 
@@ -825,12 +821,8 @@ BLI_INLINE void draw_tri_point(
         unsigned int pos, float sel_col[4], float pivot_col[4],
         float *co, float width, bool selected)
 {
-	if (selected) {
-		immUniformColor4fv(sel_col);
-	}
-	else {
-		immUniformColor4fv(pivot_col);
-	}
+	immUniformColor4fv(selected ? sel_col : pivot_col);
+
 	glLineWidth(3.0f);
 
 	float w = width / 2.0f;
@@ -860,12 +852,8 @@ BLI_INLINE void draw_rect_point(
         unsigned int pos, float sel_col[4], float handle_col[4],
         float *co, float width, bool selected)
 {
-	if (selected) {
-		immUniformColor4fv(sel_col);
-	}
-	else {
-		immUniformColor4fv(handle_col);
-	}
+	immUniformColor4fv(selected ? sel_col : handle_col);
+
 	glLineWidth(3.0f);
 
 	float w = width / 2.0f;

source/blender/editors/space_clip/clip_draw.c

@@ -1105,7 +1105,7 @@ static void draw_plane_marker_image(Scene *scene,
 			unsigned int texCoord = VertexFormat_add_attrib(imm_format, "texCoord", COMP_F32, 2, KEEP_FLOAT);
 
 			immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
-			immUniform4f("color", 1.0f, 1.0f, 1.0f, plane_track->image_opacity);
+			immUniformColor4f(1.0f, 1.0f, 1.0f, plane_track->image_opacity);
 			immUniform1i("image", GL_TEXTURE0);
 
 			immBegin(PRIM_TRIANGLE_FAN, 4);

source/blender/editors/space_sequencer/sequencer_draw.c

@@ -1310,7 +1310,7 @@ void draw_image_seq(const bContext *C, Scene *scene, ARegion *ar, SpaceSeq *sseq
 	unsigned int texCoord = VertexFormat_add_attrib(imm_format, "texCoord", COMP_F32, 2, KEEP_FLOAT);
 
 	immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
-	immUniform4f("color", 1.0f, 1.0f, 1.0f, 1.0f);
+	immUniformColor4f(1.0f, 1.0f, 1.0f, 1.0f);
 	immUniform1i("image", GL_TEXTURE0);
 
 	immBegin(PRIM_TRIANGLE_FAN, 4);

source/blender/windowmanager/intern/wm_gesture.c

@@ -226,7 +226,7 @@ static void wm_gesture_draw_rect(wmGesture *gt)
 	glEnable(GL_BLEND);
 
 	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
-	immUniform4f("color", 1.0f, 1.0f, 1.0f, 0.05f);
+	immUniformColor4f(1.0f, 1.0f, 1.0f, 0.05f);
 
 	immRecti(pos, rect->xmin, rect->ymin, rect->xmax, rect->ymax);
 

source/blender/windowmanager/intern/wm_operators.c

@@ -3089,7 +3089,7 @@ static void radial_control_paint_tex(RadialControl *rc, float radius, float alph
 
 		immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_MASK_UNIFORM_COLOR);
 
-		immUniform4f("color", col[0], col[1], col[2], alpha);
+		immUniformColor3fvAlpha(col, alpha);
 		immUniform1i("image", GL_TEXTURE0);
 
 		/* set up rotation if available */
@@ -3208,7 +3208,7 @@ static void radial_control_paint_cursor(bContext *C, int x, int y, void *customd
 	unsigned int pos = VertexFormat_add_attrib(format, "pos", COMP_F32, 2, KEEP_FLOAT);
 
 	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
-	immUniformColor3fvAlpha(col, 0.5); 
+	immUniformColor3fvAlpha(col, 0.5f);
 
 	if (rc->subtype == PROP_ANGLE) {
 		gpuPushMatrix();