Gawain: add immRect utility functions (replaces legacy glRect)

Caller is responsible for setting up vertex format, binding a shader program, and setting the color *before* calling immRect.

4 files changed, 67 insertions, 0 deletions

diff --git a/source/blender/gpu/CMakeLists.txt b/source/blender/gpu/CMakeLists.txt
index 6b23bfc4642..668a948144a 100644
--- a/source/blender/gpu/CMakeLists.txt
+++ b/source/blender/gpu/CMakeLists.txt
@@ -72,6 +72,8 @@ set(SRC
 	gawain/element.h
 	gawain/immediate.c
 	gawain/immediate.h
+	gawain/imm_util.c
+	gawain/imm_util.h
 	gawain/vertex_buffer.c
 	gawain/vertex_buffer.h
 	gawain/vertex_format.c
diff --git a/source/blender/gpu/GPU_immediate.h b/source/blender/gpu/GPU_immediate.h
index 7c4b1614f37..8e7f91b0f7f 100644
--- a/source/blender/gpu/GPU_immediate.h
+++ b/source/blender/gpu/GPU_immediate.h
@@ -31,6 +31,7 @@
 #pragma once
 
 #include "gawain/immediate.h"
+#include "gawain/imm_util.h"
 #include "GPU_shader.h"
 
 /* Extend immBindProgram to use Blender’s library of built-in shader programs.
diff --git a/source/blender/gpu/gawain/imm_util.c b/source/blender/gpu/gawain/imm_util.c
new file mode 100644
index 00000000000..0f253fec08b
--- /dev/null
+++ b/source/blender/gpu/gawain/imm_util.c
@@ -0,0 +1,46 @@
+
+// Gawain immediate mode drawing utilities
+//
+// This code is part of the Gawain library, with modifications
+// specific to integration with Blender.
+//
+// Copyright 2016 Mike Erwin
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
+// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#include "imm_util.h"
+#include "immediate.h"
+
+
+void immRectf(unsigned pos, float x1, float y1, float x2, float y2)
+{
+	immBegin(GL_TRIANGLE_FAN, 4);
+	immVertex2f(pos, x1, y1);
+	immVertex2f(pos, x2, y1);
+	immVertex2f(pos, x2, y2);
+	immVertex2f(pos, x1, y2);
+	immEnd();
+}
+
+void immRecti(unsigned pos, int x1, int y1, int x2, int y2)
+{
+	immBegin(GL_TRIANGLE_FAN, 4);
+	immVertex2i(pos, x1, y1);
+	immVertex2i(pos, x2, y1);
+	immVertex2i(pos, x2, y2);
+	immVertex2i(pos, x1, y2);
+	immEnd();
+}
+
+#if 0 // more complete version in case we want that
+void immRecti_complete(int x1, int y1, int x2, int y2, const float color[4])
+{
+	VertexFormat *format = immVertexFormat();
+	unsigned pos = add_attrib(format, "pos", GL_INT, 2, CONVERT_INT_TO_FLOAT);
+	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+	immUniformColor4fv(color);
+	immRecti(pos, x1, y1, x2, y2);
+	immUnbindProgram();
+}
+#endif
diff --git a/source/blender/gpu/gawain/imm_util.h b/source/blender/gpu/gawain/imm_util.h
new file mode 100644
index 00000000000..730bd7c1a3c
--- /dev/null
+++ b/source/blender/gpu/gawain/imm_util.h
@@ -0,0 +1,18 @@
+
+// Gawain immediate mode drawing utilities
+//
+// This code is part of the Gawain library, with modifications
+// specific to integration with Blender.
+//
+// Copyright 2016 Mike Erwin
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
+// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#pragma once
+
+
+// Draw 2D rectangles (replaces glRect functions)
+// caller is reponsible for vertex format & shader
+void immRectf(unsigned pos, float x1, float y1, float x2, float y2);
+void immRecti(unsigned pos, int x1, int y1, int x2, int y2);