bf_gpu: Add GPU_state module.

This has wrappers for the most common gl* functions in the codebase, and is in preparation for D3502

Reviewers: brecht, fclem

Differential Revision: https://developer.blender.org/D3501

1 files changed, 150 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_state.c b/source/blender/gpu/intern/gpu_state.c
new file mode 100644
index 00000000000..1cd531fee30
--- /dev/null
+++ b/source/blender/gpu/intern/gpu_state.c
@@ -0,0 +1,150 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Ray Molenkamp
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/gpu/intern/gpu_state.c
+ *  \ingroup gpu
+ *
+ */
+
+#include "GPU_glew.h"
+#include "GPU_state.h"
+
+static GLenum gpu_get_gl_blendfunction(GPUBlendFunction blend)
+{
+	switch (blend)
+	{
+	case GPU_ONE:
+		return GL_ONE;
+	case GPU_SRC_ALPHA:
+		return GL_SRC_ALPHA;
+	case GPU_ONE_MINUS_SRC_ALPHA:
+		return GL_ONE_MINUS_SRC_ALPHA;
+	default:
+		BLI_assert(!"Unhandled blend mode");
+		return GL_ZERO;
+	}
+}
+
+void GPU_blend(bool enable)
+{
+	if (enable) {
+		glEnable(GL_BLEND);
+	}
+	else {
+		glDisable(GL_BLEND);
+	}
+}
+
+void GPU_blend_set_func(GPUBlendFunction sfactor, GPUBlendFunction dfactor)
+{
+	glBlendFunc(gpu_get_gl_blendfunction(sfactor), gpu_get_gl_blendfunction(dfactor));
+}
+
+void GPU_blend_set_func_separate(
+	GPUBlendFunction src_rgb, GPUBlendFunction dst_rgb,
+	GPUBlendFunction src_alpha, GPUBlendFunction dst_alpha)
+{
+	glBlendFuncSeparate(gpu_get_gl_blendfunction(src_rgb),
+		gpu_get_gl_blendfunction(dst_rgb),
+		gpu_get_gl_blendfunction(src_alpha),
+		gpu_get_gl_blendfunction(dst_alpha));
+}
+
+void GPU_depth_test(bool enable)
+{
+	if (enable) {
+		glEnable(GL_DEPTH_TEST);
+	}
+	else {
+		glDisable(GL_DEPTH_TEST);
+	}
+}
+
+bool GPU_depth_test_enabled()
+{
+	return glIsEnabled(GL_DEPTH_TEST);
+}
+
+void GPU_line_smooth(bool enable)
+{
+	if (enable) {
+		glEnable(GL_LINE_SMOOTH);
+	}
+	else {
+		glDisable(GL_LINE_SMOOTH);
+	}
+}
+
+void GPU_line_stipple(bool enable)
+{
+	if (enable) {
+		glEnable(GL_LINE_STIPPLE);
+	}
+	else {
+		glDisable(GL_LINE_STIPPLE);
+	}
+}
+
+void GPU_line_width(float width)
+{
+	glLineWidth(width);
+}
+
+void GPU_point_size(float size)
+{
+	glPointSize(size);
+}
+
+void GPU_polygon_smooth(bool enable)
+{
+	if (enable) {
+		glEnable(GL_POLYGON_SMOOTH);
+	}
+	else {
+		glDisable(GL_POLYGON_SMOOTH);
+	}
+}
+
+void GPU_scissor(int x, int y, int width, int height)
+{
+	glScissor(x, y, width, height);
+}
+
+void GPU_scissor_getf(float coords[4])
+{
+	glGetFloatv(GL_SCISSOR_BOX, coords);
+}
+
+void GPU_scissor_geti(int coords[4])
+{
+	glGetIntegerv(GL_SCISSOR_BOX, coords);
+}
+
+void GPU_viewport_size_getf(float coords[4])
+{
+	glGetFloatv(GL_VIEWPORT, coords);
+}
+
+void GPU_viewport_size_geti(int coords[4])
+{
+	glGetIntegerv(GL_VIEWPORT, coords);
+}