AllegroGL 0.4.4

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Allegro Graphics Driver

These functions are used to implement Allegro function over an OpenGL screen. More...

## Macros
#define | SET_TEX_COORDS(x, y)
#define | BITMAP_BLIT_CLIP(source, dest, source_x, source_y, dest_x, dest_y, width, height)

## Functions
int | __allegro_gl_make_power_of_2 (int x)
void | allegro_gl_drawing_mode (void)
void | split_color (int color, GLubyte *r, GLubyte *g, GLubyte *b, GLubyte *a, int color_depth)
void | allegro_gl_created_sub_bitmap (BITMAP *bmp, BITMAP *parent)
static void | allegro_gl_screen_acquire (struct BITMAP *bmp)
| acquire_bitmap(screen) overload. More...
static void | allegro_gl_screen_release (struct BITMAP *bmp)
| release_bitmap(screen) overload. More...
static int | allegro_gl_screen_getpixel (struct BITMAP *bmp, int x, int y)
static void | allegro_gl_screen_putpixel (struct BITMAP *bmp, int x, int y, int color)
static void | allegro_gl_screen_vline (struct BITMAP *bmp, int x, int y1, int y2, int color)
static void | allegro_gl_screen_hline (struct BITMAP *bmp, int x1, int y, int x2, int color)
static void | allegro_gl_screen_line (struct BITMAP *bmp, int x1, int y1, int x2, int y2, int color)
void | allegro_gl_screen_rectfill (struct BITMAP *bmp, int x1, int y1, int x2, int y2, int color)
static void | allegro_gl_screen_triangle (struct BITMAP *bmp, int x1, int y1, int x2, int y2, int x3, int y3, int color)
static void | allegro_gl_screen_blit_from_memory (struct BITMAP *source, struct BITMAP *dest, int source_x, int source_y, int dest_x, int dest_y, int width, int height)
static void | allegro_gl_screen_blit_to_memory (struct BITMAP *source, struct BITMAP *dest, int source_x, int source_y, int dest_x, int dest_y, int width, int height)
void | allegro_gl_screen_blit_to_self (struct BITMAP *source, struct BITMAP *dest, int source_x, int source_y, int dest_x, int dest_y, int width, int height)
void | allegro_gl_upload_and_display_texture (struct BITMAP *source, int source_x, int source_y, int dest_x, int dest_y, int width, int height, int flip_dir, GLint format, GLint type)
static void | do_screen_masked_blit_standard (GLint format, GLint type, struct BITMAP *temp, int source_x, int source_y, int dest_x, int dest_y, int width, int height, int flip_dir, int blit_type)
static void | screen_masked_blit_standard (struct BITMAP *source, int source_x, int source_y, int dest_x, int dest_y, int width, int height, int flip_dir, int blit_type)
static void | __allegro_gl_init_nv_register_combiners (BITMAP *bmp)
static void | screen_masked_blit_nv_register (struct BITMAP *source, int source_x, int source_y, int dest_x, int dest_y, int width, int height, int flip_dir, int blit_type)
static void | __allegro_gl_init_combine_textures (BITMAP *bmp)
static void | screen_masked_blit_combine_tex (struct BITMAP *source, int source_x, int source_y, int dest_x, int dest_y, int width, int height, int flip_dir, int blit_type)
void | do_masked_blit_screen (struct BITMAP *source, struct BITMAP *dest, int source_x, int source_y, int dest_x, int dest_y, int width, int height, int flip_dir, int blit_type)
static BITMAP * | __allegro_gl_convert_rle_sprite (AL_CONST struct RLE_SPRITE *sprite, int trans)
void | allegro_gl_screen_draw_rle_sprite (struct BITMAP *bmp, AL_CONST struct RLE_SPRITE *sprite, int x, int y)
static void | allegro_gl_screen_draw_trans_rgba_rle_sprite (struct BITMAP *bmp, AL_CONST struct RLE_SPRITE *sprite, int x, int y)
static void | allegro_gl_screen_masked_blit (struct BITMAP *source, struct BITMAP *dest, int source_x, int source_y, int dest_x, int dest_y, int width, int height)
static void | allegro_gl_screen_draw_sprite (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y)
static void | allegro_gl_screen_draw_sprite_v_flip (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y)
static void | allegro_gl_screen_draw_sprite_h_flip (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y)
static void | allegro_gl_screen_draw_sprite_vh_flip (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y)
static void | allegro_gl_screen_pivot_scaled_sprite_flip (struct BITMAP *bmp, struct BITMAP *sprite, fixed x, fixed y, fixed cx, fixed cy, fixed angle, fixed scale, int v_flip)
static void | allegro_gl_screen_draw_trans_rgba_sprite (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y)
static void | allegro_gl_screen_draw_sprite_ex (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y, int mode, int flip)
void | allegro_gl_screen_draw_glyph_ex (struct BITMAP *bmp, AL_CONST struct FONT_GLYPH *glyph, int x, int y, int color, int bg, int flip)
static void | allegro_gl_screen_draw_glyph (struct BITMAP *bmp, AL_CONST struct FONT_GLYPH *glyph, int x, int y, int color, int bg)
void | allegro_gl_screen_draw_color_glyph_ex (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y, int color, int bg, int flip)
static void | allegro_gl_screen_draw_color_glyph (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y, int color, int bg)
static void | allegro_gl_screen_draw_character (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y, int color, int bg)
static void | allegro_gl_screen_draw_256_sprite (struct BITMAP *bmp, struct BITMAP *sprite, int x, int y)
void | allegro_gl_screen_clear_to_color (struct BITMAP *bmp, int color)
static void | allegro_gl_screen_polygon (struct BITMAP *bmp, int vertices, AL_CONST int *points, int color)
static void | allegro_gl_screen_rect (struct BITMAP *bmp, int x1, int y1, int x2, int y2, int color)
void | allegro_gl_screen_polygon3d_f (struct BITMAP *bmp, int type, struct BITMAP *texture, int vc, V3D_f *vtx[])
static void | allegro_gl_screen_polygon3d (struct BITMAP *bmp, int type, struct BITMAP *texture, int vc, V3D *vtx[])
static void | allegro_gl_screen_quad3d_f (struct BITMAP *bmp, int type, struct BITMAP *texture, V3D_f *v1, V3D_f *v2, V3D_f *v3, V3D_f *v4)
static void | allegro_gl_screen_quad3d (struct BITMAP *bmp, int type, struct BITMAP *texture, V3D *v1, V3D *v2, V3D *v3, V3D *v4)
static void | allegro_gl_screen_triangle3d (struct BITMAP *bmp, int type, struct BITMAP *texture, V3D *v1, V3D *v2, V3D *v3)
static void | allegro_gl_screen_triangle3d_f (struct BITMAP *bmp, int type, struct BITMAP *texture, V3D_f *v1, V3D_f *v2, V3D_f *v3)
void | __allegro_gl__glvtable_update_vtable (GFX_VTABLE **vtable)
void | allegro_gl_memory_blit_between_formats (struct BITMAP *src, struct BITMAP *dest, int source_x, int source_y, int dest_x, int dest_y, int width, int height)
static void | dummy_unwrite_bank (void)
static void | allegro_gl_video_acquire (struct BITMAP *bmp)
| acquire_bitmap(bmp) overload. More...
static void | allegro_gl_video_release (struct BITMAP *bmp)
| release_bitmap(bmp) overload. More...

## Variables
static double | allegro_gl_projection_matrix [16]
static double | allegro_gl_modelview_matrix [16]
static GFX_VTABLE | allegro_gl_screen_vtable

## Detailed Description

These functions are used to implement Allegro function over an OpenGL screen.

Keep in mind that some restictions mentioned in Allegro docs about video bitmaps and the screen do not apply when using AllegroGL GFX driver. Namely:

- Reading from video bitmaps is just as fast as reading from memory bitmaps.
- Doing translucent/transparent drawing on the screen can be very fast if the source is a video bitmap.
- Drawing from video bitmap to a video bitmap will be pretty fast on modern GFX cards with appropiate drivers installed.
- There are dozen of places in the Allegro docs where it says that a memory bitmap must be used (drawing_mode(), polygon3d(), stretch_sprite() etc.). This doesn't apply when AllegroGL is used. You can also use video bitmaps and it will be quite fast.

## Macro Definition Documentation

#define SET_TEX_COORDS | ( |  | x,
|  |  | y
| ) |  |

Value:
do { \
if (__agl_drawing_pattern_tex) { \
glTexCoord2f ( \
(x - _drawing_x_anchor) / (float)__agl_drawing_pattern_bmp->w,\
(y - _drawing_y_anchor) / (float)__agl_drawing_pattern_bmp->h \
); \
} \
} while(0)

Definition at line 348 of file glvtable.c.

## Function Documentation

static void allegro_gl_screen_acquire | ( | struct BITMAP * | bmp | ) |
| static

acquire_bitmap(screen) overload.

This doesn't do anything, since OpenGL rendering context doesn't need locking. You don't need to call this function in your program.

Definition at line 160 of file glvtable.c.

Referenced by allegro_gl_unset_projection().

static void allegro_gl_screen_release | ( | struct BITMAP * | bmp | ) |
| static

release_bitmap(screen) overload.

This doesn't do anything, since OpenGL rendering context doesn't need locking. You don't need to call this function in your program.

Definition at line 170 of file glvtable.c.

References AGL_TEXTURE_HAS_ALPHA, AGL_TEXTURE_MASKED, and allegro_gl_extensions_GL.

Referenced by allegro_gl_unset_projection().

static void allegro_gl_video_acquire | ( | struct BITMAP * | bmp | ) |
| static

acquire_bitmap(bmp) overload.

This doesn't do anything, since OpenGL textures doesn't need locking. You don't need to call this function in your program.

Definition at line 437 of file videovtb.c.

Referenced by allegro_gl_video_release().

static void allegro_gl_video_release | ( | struct BITMAP * | bmp | ) |
| static

release_bitmap(bmp) overload.

This doesn't do anything, since OpenGL textures doesn't need locking. You don't need to call this function in your program.

Definition at line 448 of file videovtb.c.

References AGL_TEXTURE_HAS_ALPHA, allegro_gl_extensions_GL, and allegro_gl_video_acquire().