OpenGL: add gpuLoadProjectionMatrix3D function

Make an existing 4x4 matrix the current projection.
Found a need for this while converting code to new API.
Part of T49450

1 files changed, 28 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_matrix.c b/source/blender/gpu/intern/gpu_matrix.c
index cbef2d7373e..8cc51176310 100644
--- a/source/blender/gpu/intern/gpu_matrix.c
+++ b/source/blender/gpu/intern/gpu_matrix.c
@@ -32,6 +32,8 @@
 #define SUPPRESS_GENERIC_MATRIX_API
 #include "GPU_matrix.h"
 
+#include "BIF_glutil.h"
+
 #include "BLI_math_matrix.h"
 #include "BLI_math_rotation.h"
 #include "BLI_math_vector.h"
@@ -185,6 +187,32 @@ void gpuLoadMatrix3D(const float m[4][4])
 	state.dirty = true;
 }
 
+void gpuLoadProjectionMatrix3D(const float m[4][4])
+{
+#if SUPPORT_LEGACY_MATRIX
+	if (state.mode == MATRIX_MODE_INACTIVE) {
+		GLenum mode = glaGetOneInt(GL_MATRIX_MODE);
+		if (mode != GL_PROJECTION_MATRIX) {
+			glMatrixMode(GL_PROJECTION_MATRIX);
+		}
+
+		glLoadMatrixf((const float*) m);
+
+		if (mode != GL_PROJECTION_MATRIX) {
+			glMatrixMode(mode); /* restore */
+		}
+
+		state.dirty = true;
+		return;
+	}
+#endif
+
+	BLI_assert(state.mode == MATRIX_MODE_3D);
+	copy_m4_m4(Projection3D, m);
+	CHECKMAT(Projection3D);
+	state.dirty = true;
+}
+
 void gpuLoadMatrix2D(const float m[3][3])
 {
 	BLI_assert(state.mode == MATRIX_MODE_2D);