[Bf-blender-cvs] [0a274df536] blender2.8: OpenGL: add gpuLoadProjectionMatrix3D function

[Mike Erwin]

Commit: 0a274df536251adbb7141f6baf8a95af89e50710
Author: Mike Erwin
Date:   Tue Mar 21 18:10:20 2017 -0400
Branches: blender2.8
https://developer.blender.org/rB0a274df536251adbb7141f6baf8a95af89e50710

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

===================================================================

M	source/blender/gpu/GPU_matrix.h
M	source/blender/gpu/intern/gpu_matrix.c

===================================================================

diff --git a/source/blender/gpu/GPU_matrix.h b/source/blender/gpu/GPU_matrix.h
index dd65d39822..d0194659db 100644
--- a/source/blender/gpu/GPU_matrix.h
+++ b/source/blender/gpu/GPU_matrix.h
@@ -106,6 +106,8 @@ void gpuRotate2D(float deg);
 
 /* 3D Projection Matrix */
 
+void gpuLoadProjectionMatrix3D(const float m[4][4]);
+
 void gpuOrtho(float left, float right, float bottom, float top, float near, float far);
 void gpuFrustum(float left, float right, float bottom, float top, float near, float far);
 void gpuPerspective(float fovy, float aspect, float near, float far);
@@ -174,6 +176,8 @@ bool gpuMatricesDirty(void); /* since last bind */
 #  define gpuMultMatrix3D(x)  gpuMultMatrix3D((const float (*)[4])(x))
 #  define gpuLoadMatrix3D(x)  gpuLoadMatrix3D((const float (*)[4])(x))
 
+#  define gpuLoadProjectionMatrix3D(x)  gpuLoadProjectionMatrix3D((const float (*)[4])(x))
+
 #  define gpuMultMatrix2D(x)  gpuMultMatrix2D((const float (*)[3])(x))
 #  define gpuLoadMatrix2D(x)  gpuLoadMatrix2D((const float (*)[3])(x))
 
diff --git a/source/blender/gpu/intern/gpu_matrix.c b/source/blender/gpu/intern/gpu_matrix.c
index cbef2d7373..8cc5117631 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);