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Suckless OGL 1.0.0
A lean, high-performance C11 PBR Renderer
billboard_rendering.h
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1 
11 #ifndef BILLBOARD_RENDERING_H
12 #define BILLBOARD_RENDERING_H
13 
14 #include "gl_common.h"
15 #include "instanced_rendering.h" /* For SphereInstance */
16 #include "shader.h"
17 
22 typedef struct {
23  GLuint
24  vao;
25  GLuint instance_vbo;
27  int instance_count;
28  int capacity;
29  GLuint vao_wire_quad;
30  GLuint vao_wire_box;
31 } BillboardGroup;
32 
45 void billboard_group_init(BillboardGroup* group, const SphereInstance* data,
46  int count);
47 
57 void billboard_group_prepare(BillboardGroup* group, GLuint quad_vbo,
58  GLuint wire_quad_vbo, GLuint wire_cube_vbo);
59 
64 void billboard_group_draw(BillboardGroup* group);
65 
74 void billboard_group_update(BillboardGroup* group, const SphereInstance* data,
75  int count);
76 
87 void billboard_group_update_from_buffer(BillboardGroup* group,
88  GLuint src_buffer, int count);
89 
94 void billboard_group_cleanup(BillboardGroup* group);
95 
102 void billboard_group_draw_debug_fill(BillboardGroup* group);
103 
110 void billboard_group_draw_debug_quads(BillboardGroup* group);
111 
118 void billboard_group_draw_debug_boxes(BillboardGroup* group);
119 
120 #endif /* BILLBOARD_RENDERING_H */
billboard_group_init
void billboard_group_init(BillboardGroup *group, const SphereInstance *data, int count)
Initializes the billboard group and allocates GPU memory.
Definition: billboard_rendering.c:11
billboard_group_draw_debug_quads
void billboard_group_draw_debug_quads(BillboardGroup *group)
Draws wireframe quads for each instance.
Definition: billboard_rendering.c:187
billboard_group_draw_debug_fill
void billboard_group_draw_debug_fill(BillboardGroup *group)
Draws filled quads for each instance (for debug transparency).
Definition: billboard_rendering.c:177
billboard_group_draw
void billboard_group_draw(BillboardGroup *group)
Executes the instanced draw call for all billboards in the group.
Definition: billboard_rendering.c:146
billboard_group_prepare
void billboard_group_prepare(BillboardGroup *group, GLuint quad_vbo, GLuint wire_quad_vbo, GLuint wire_cube_vbo)
Prepares the VAO by linking a shared quad VBO with internal instance data.
Definition: billboard_rendering.c:136
billboard_group_update_from_buffer
void billboard_group_update_from_buffer(BillboardGroup *group, GLuint src_buffer, int count)
Updates instance data on the GPU by copying from another GPU buffer (e.g. SSBO).
Definition: billboard_rendering.c:69
billboard_group_update
void billboard_group_update(BillboardGroup *group, const SphereInstance *data, int count)
Updates instance data on the GPU.
Definition: billboard_rendering.c:32
billboard_group_draw_debug_boxes
void billboard_group_draw_debug_boxes(BillboardGroup *group)
Draws wireframe boxes for each instance.
Definition: billboard_rendering.c:203
billboard_group_cleanup
void billboard_group_cleanup(BillboardGroup *group)
Releases all GPU resources allocated for the billboard group.
Definition: billboard_rendering.c:169
gl_common.h
Common OpenGL definitions, RAII helpers, and utilities.
instanced_rendering.h
Mesh-based instanced rendering for spheres.
shader.h
High-level OpenGL shader management with metadata and uniform caching.
BillboardGroup
Manages a set of billboarded instances on the GPU.
Definition: billboard_rendering.h:22
BillboardGroup::vao_wire_quad
GLuint vao_wire_quad
Definition: billboard_rendering.h:29
BillboardGroup::vao
GLuint vao
Definition: billboard_rendering.h:24
BillboardGroup::instance_vbo
GLuint instance_vbo
Definition: billboard_rendering.h:25
BillboardGroup::instance_count
int instance_count
Definition: billboard_rendering.h:27
BillboardGroup::vao_wire_box
GLuint vao_wire_box
Definition: billboard_rendering.h:30
BillboardGroup::capacity
int capacity
Definition: billboard_rendering.h:28
SphereInstance
Per-instance data sent to the shader via an instanced VBO.
Definition: instanced_rendering.h:23