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Small draw optimization: Draw sky with glDrawElements. Calculate

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positions and indices once and update only colours each frame.
This commit is contained in:
Antony Riakiotakis
2013-01-06 18:38:16 +00:00
parent bbd95fafef
commit af143b7378
1 changed files with 36 additions and 19 deletions
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55
source/blender/editors/space_view3d/view3d_draw.c
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@@ -3001,7 +3001,9 @@ static void view3d_main_area_draw_objects(const bContext *C, ARegion *ar, const
#define YTOT 16
GLubyte grid_col[XTOT][YTOT][4];
float grid_pos[XTOT][YTOT][2];
static float grid_pos[XTOT][YTOT][2];
static GLushort indices[XTOT-1][XTOT-1][4];
static char buf_calculated = FALSE;
IMB_colormanagement_pixel_to_display_space_v3(col_hor, &scene->world->horr, &scene->view_settings,
&scene->display_settings);
@@ -3019,6 +3021,31 @@ static void view3d_main_area_draw_objects(const bContext *C, ARegion *ar, const
glShadeModel(GL_SMOOTH);
/* calculate buffers the first time only */
if (!buf_calculated) {
for (x = 0; x < XTOT; x++) {
for (y = 0; y < YTOT; y++) {
const float xf = (float)x / (float)(XTOT - 1);
const float yf = (float)y / (float)(YTOT - 1);
/* -1..1 range */
grid_pos[x][y][0] = (xf - 0.5f) * 2.0f;
grid_pos[x][y][1] = (yf - 0.5f) * 2.0f;
}
}
for (x = 0; x < XTOT - 1; x++) {
for (y = 0; y < YTOT - 1; y++) {
indices[x][y][0] = x*XTOT + y;
indices[x][y][1] = x*XTOT + y + 1;
indices[x][y][2] = (x + 1)*XTOT + y + 1;
indices[x][y][3] = (x + 1)*XTOT + y;
}
}
buf_calculated = TRUE;
}
for (x = 0; x < XTOT; x++) {
for (y = 0; y < YTOT; y++) {
const float xf = (float)x / (float)(XTOT - 1);
@@ -3031,10 +3058,6 @@ static void view3d_main_area_draw_objects(const bContext *C, ARegion *ar, const
float col_fac;
float col_fl[3];
/* -1..1 range */
grid_pos[x][y][0] = (xf - 0.5f) * 2.0f;
grid_pos[x][y][1] = (yf - 0.5f) * 2.0f;
ED_view3d_win_to_vector(ar, mval, out);
if (scene->world->skytype & WO_SKYPAPER) {
@@ -3061,20 +3084,14 @@ static void view3d_main_area_draw_objects(const bContext *C, ARegion *ar, const
}
}
glBegin(GL_QUADS);
for (x = 0; x < XTOT - 1; x++) {
for (y = 0; y < YTOT - 1; y++) {
glColor4ubv(grid_col[x][y]);
glVertex2fv(grid_pos[x][y]);
glColor4ubv(grid_col[x][y + 1]);
glVertex2fv(grid_pos[x][y + 1]);
glColor4ubv(grid_col[x + 1][y + 1]);
glVertex2fv(grid_pos[x + 1][y + 1]);
glColor4ubv(grid_col[x + 1][y]);
glVertex2fv(grid_pos[x + 1][y]);
}
}
glEnd();
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, grid_pos);
glColorPointer(4, GL_UNSIGNED_BYTE, 0, grid_col);
glDrawElements(GL_QUADS, (XTOT - 1)*(YTOT - 1)*4, GL_UNSIGNED_SHORT, indices);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glMatrixMode(GL_PROJECTION);
glPopMatrix();