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DrwManager: Add the possibility to invert backfacing.

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This is done in order to support planar reflection rendering.
This commit is contained in:
Clément Foucault
2017-06-16 13:27:09 +02:00
parent 8a10fa1c53
commit 9a040fa3d4
2 changed files with 17 additions and 2 deletions
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18
source/blender/draw/intern/draw_manager.c
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@@ -290,6 +290,8 @@ static struct DRWGlobalState {
float screenvecs[2][3];
float pixsize;
GLenum backface, frontface;
struct {
unsigned int is_select : 1;
unsigned int is_depth : 1;
@@ -1792,7 +1794,7 @@ static void draw_shgroup(DRWShadingGroup *shgroup, DRWState pass_state)
/* Negative scale objects */
if (neg_scale) {
glFrontFace(GL_CW);
glFrontFace(DST.backface);
}
GPU_SELECT_LOAD_IF_PICKSEL(call);
@@ -1809,7 +1811,7 @@ static void draw_shgroup(DRWShadingGroup *shgroup, DRWState pass_state)
/* Reset state */
if (neg_scale) {
glFrontFace(GL_CCW);
glFrontFace(DST.frontface);
}
}
}
@@ -1901,6 +1903,13 @@ void DRW_state_reset(void)
DRW_state_reset_ex(DRW_STATE_DEFAULT);
}
/* NOTE : Make sure to reset after use! */
void DRW_state_invert_facing(void)
{
SWAP(GLenum, DST.backface, DST.frontface);
glFrontFace(DST.frontface);
}
/** \} */
@@ -2249,6 +2258,11 @@ static void DRW_viewport_var_init(void)
/* Refresh DST.pixelsize */
DST.pixsize = rv3d->pixsize;
/* Reset facing */
DST.frontface = GL_CCW;
DST.backface = GL_CW;
glFrontFace(DST.frontface);
}
void DRW_viewport_matrix_get(float mat[4][4], DRWViewportMatrixType type)