BFL: Fix broken vertical texts.

I've made a separate version of the geom shader that works with full
3D modelviewmat.

This commit also includes some fixup inside blf_batching_start().

7 files changed, 75 insertions, 16 deletions

diff --git a/source/blender/gpu/CMakeLists.txt b/source/blender/gpu/CMakeLists.txt
index c754a21b427..f0e5b0842fc 100644
--- a/source/blender/gpu/CMakeLists.txt
+++ b/source/blender/gpu/CMakeLists.txt
@@ -202,6 +202,8 @@ data_to_c_simple(shaders/gpu_shader_edges_overlay_vert.glsl SRC)
 data_to_c_simple(shaders/gpu_shader_edges_overlay_geom.glsl SRC)
 data_to_c_simple(shaders/gpu_shader_edges_overlay_simple_geom.glsl SRC)
 data_to_c_simple(shaders/gpu_shader_edges_overlay_frag.glsl SRC)
+data_to_c_simple(shaders/gpu_shader_text_simple_vert.glsl SRC)
+data_to_c_simple(shaders/gpu_shader_text_simple_geom.glsl SRC)
 data_to_c_simple(shaders/gpu_shader_text_vert.glsl SRC)
 data_to_c_simple(shaders/gpu_shader_text_geom.glsl SRC)
 data_to_c_simple(shaders/gpu_shader_text_frag.glsl SRC)
diff --git a/source/blender/gpu/GPU_shader.h b/source/blender/gpu/GPU_shader.h
index 6a156b32c35..1a1ec120d28 100644
--- a/source/blender/gpu/GPU_shader.h
+++ b/source/blender/gpu/GPU_shader.h
@@ -97,6 +97,7 @@ typedef enum GPUBuiltinShader {
 
 	/* specialized drawing */
 	GPU_SHADER_TEXT,
+	GPU_SHADER_TEXT_SIMPLE,
 	GPU_SHADER_EDGES_FRONT_BACK_PERSP,
 	GPU_SHADER_EDGES_FRONT_BACK_ORTHO,
 	GPU_SHADER_EDGES_OVERLAY_SIMPLE,
diff --git a/source/blender/gpu/intern/gpu_shader.c b/source/blender/gpu/intern/gpu_shader.c
index 586a7b70cd9..ad6331befce 100644
--- a/source/blender/gpu/intern/gpu_shader.c
+++ b/source/blender/gpu/intern/gpu_shader.c
@@ -137,6 +137,8 @@ extern char datatoc_gpu_shader_edges_overlay_frag_glsl[];
 extern char datatoc_gpu_shader_text_vert_glsl[];
 extern char datatoc_gpu_shader_text_geom_glsl[];
 extern char datatoc_gpu_shader_text_frag_glsl[];
+extern char datatoc_gpu_shader_text_simple_vert_glsl[];
+extern char datatoc_gpu_shader_text_simple_geom_glsl[];
 extern char datatoc_gpu_shader_keyframe_diamond_vert_glsl[];
 extern char datatoc_gpu_shader_keyframe_diamond_frag_glsl[];
 
@@ -653,6 +655,9 @@ GPUShader *GPU_shader_get_builtin_shader(GPUBuiltinShader shader)
 		[GPU_SHADER_TEXT] = { datatoc_gpu_shader_text_vert_glsl,
 		                      datatoc_gpu_shader_text_frag_glsl,
 		                      datatoc_gpu_shader_text_geom_glsl },
+		[GPU_SHADER_TEXT_SIMPLE] = { datatoc_gpu_shader_text_simple_vert_glsl,
+		                             datatoc_gpu_shader_text_frag_glsl,
+		                             datatoc_gpu_shader_text_simple_geom_glsl },
 		[GPU_SHADER_KEYFRAME_DIAMOND] = { datatoc_gpu_shader_keyframe_diamond_vert_glsl,
 		                                  datatoc_gpu_shader_keyframe_diamond_frag_glsl },
 		[GPU_SHADER_EDGES_FRONT_BACK_PERSP] = { datatoc_gpu_shader_edges_front_back_persp_vert_glsl,
diff --git a/source/blender/gpu/shaders/gpu_shader_text_geom.glsl b/source/blender/gpu/shaders/gpu_shader_text_geom.glsl
index d12b60be9e9..d4d86db6bc3 100644
--- a/source/blender/gpu/shaders/gpu_shader_text_geom.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_text_geom.glsl
@@ -1,4 +1,6 @@
 
+uniform mat4 ModelViewProjectionMatrix;
+
 layout(points) in;
 layout(triangle_strip, max_vertices = 4) out;
 
@@ -12,22 +14,21 @@ noperspective out vec2 texCoord_interp;
 void main()
 {
 	color_flat = color[0];
-	gl_Position.zw = vec2(0.0, 1.0);
 
-	gl_Position.xy  = pos_rect[0].xy;
-	texCoord_interp = tex_rect[0].xw;
+	gl_Position = (ModelViewProjectionMatrix * vec4(pos_rect[0].xy, 0.0, 1.0));
+	texCoord_interp = tex_rect[0].xy;
 	EmitVertex();
 
-	gl_Position.xy  = pos_rect[0].zy;
-	texCoord_interp = tex_rect[0].zw;
+	gl_Position = (ModelViewProjectionMatrix * vec4(pos_rect[0].zy, 0.0, 1.0));
+	texCoord_interp = tex_rect[0].zy;
 	EmitVertex();
 
-	gl_Position.xy  = pos_rect[0].xw;
-	texCoord_interp = tex_rect[0].xy;
+	gl_Position = (ModelViewProjectionMatrix * vec4(pos_rect[0].xw, 0.0, 1.0));
+	texCoord_interp = tex_rect[0].xw;
 	EmitVertex();
 
-	gl_Position.xy  = pos_rect[0].zw;
-	texCoord_interp = tex_rect[0].zy;
+	gl_Position = (ModelViewProjectionMatrix * vec4(pos_rect[0].zw, 0.0, 1.0));
+	texCoord_interp = tex_rect[0].zw;
 	EmitVertex();
 
 	EndPrimitive();
diff --git a/source/blender/gpu/shaders/gpu_shader_text_simple_geom.glsl b/source/blender/gpu/shaders/gpu_shader_text_simple_geom.glsl
new file mode 100644
index 00000000000..79dc996997b
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_text_simple_geom.glsl
@@ -0,0 +1,34 @@
+
+layout(points) in;
+layout(triangle_strip, max_vertices = 4) out;
+
+in vec4 pos_rect[];
+in vec4 tex_rect[];
+in vec4 color[];
+
+flat out vec4 color_flat;
+noperspective out vec2 texCoord_interp;
+
+void main()
+{
+	color_flat = color[0];
+	gl_Position.zw = vec2(0.0, 1.0);
+
+	gl_Position.xy  = pos_rect[0].xy;
+	texCoord_interp = tex_rect[0].xy;
+	EmitVertex();
+
+	gl_Position.xy  = pos_rect[0].zy;
+	texCoord_interp = tex_rect[0].zy;
+	EmitVertex();
+
+	gl_Position.xy  = pos_rect[0].xw;
+	texCoord_interp = tex_rect[0].xw;
+	EmitVertex();
+
+	gl_Position.xy  = pos_rect[0].zw;
+	texCoord_interp = tex_rect[0].zw;
+	EmitVertex();
+
+	EndPrimitive();
+}
diff --git a/source/blender/gpu/shaders/gpu_shader_text_simple_vert.glsl b/source/blender/gpu/shaders/gpu_shader_text_simple_vert.glsl
new file mode 100644
index 00000000000..4a2cde71e07
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_text_simple_vert.glsl
@@ -0,0 +1,22 @@
+
+/* Simpler version of gpu_shader_text_vert that supports only 2D translation. */
+
+uniform mat4 ModelViewProjectionMatrix;
+
+in vec4 pos; /* rect */
+in vec4 tex; /* rect */
+in vec4 col;
+
+out vec4 pos_rect;
+out vec4 tex_rect;
+out vec4 color;
+
+void main()
+{
+	/* Manual mat4*vec2 */
+	pos_rect  = ModelViewProjectionMatrix[0].xyxy * pos.xxzz;
+	pos_rect += ModelViewProjectionMatrix[1].xyxy * pos.yyww;
+	pos_rect += ModelViewProjectionMatrix[3].xyxy;
+	tex_rect = tex;
+	color = col;
+}
diff --git a/source/blender/gpu/shaders/gpu_shader_text_vert.glsl b/source/blender/gpu/shaders/gpu_shader_text_vert.glsl
index d8e46aca975..338156f5b68 100644
--- a/source/blender/gpu/shaders/gpu_shader_text_vert.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_text_vert.glsl
@@ -11,13 +11,7 @@ out vec4 color;
 
 void main()
 {
-	/* This won't work for real 3D ModelViewProjectionMatrix. */
-	vec2 v1 = (ModelViewProjectionMatrix * vec4(pos.xy, 0.0, 1.0)).xy;
-	vec2 v2 = (ModelViewProjectionMatrix * vec4(pos.zw, 0.0, 1.0)).xy;
-
-	pos_rect.xy = min(v1, v2);
-	pos_rect.zw = max(v1, v2);
-
+	pos_rect = pos;
 	tex_rect = tex;
 	color = col;
 }