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#include "imm_renderer_impl.h"
#include <gfx/core.h>
#include <gfx/llr/llr.h>
#include <gfx/renderer/imm_renderer.h>
#include <gfx/util/shader.h>
#include <math/aabb3.h>
#include <assert.h>
#include <string.h> // memcpy
bool gfx_imm_make(ImmRenderer* renderer, GfxCore* gfxcore, LLR* llr) {
assert(renderer);
assert(gfxcore);
assert(llr);
const size_t num_triangle_verts = GFX_IMM_MAX_NUM_TRIANGLES * 3;
renderer->gfxcore = gfxcore;
renderer->llr = llr;
renderer->triangles = gfx_make_geometry(
gfxcore,
&(GeometryDesc){.type = Triangles,
.buffer_usage = BufferDynamic,
.num_verts = num_triangle_verts,
.positions3d = (BufferView3d){
.size_bytes = num_triangle_verts * sizeof(vec3)}});
if (!renderer->triangles) {
goto cleanup;
}
renderer->shader = gfx_make_immediate_mode_shader(gfxcore);
if (!renderer->shader) {
goto cleanup;
}
gfx_imm_set_colour(renderer, vec4_make(0.0f, 0.0f, 0.0f, 1.0f));
return true;
cleanup:
gfx_imm_destroy(renderer);
return false;
}
void gfx_imm_destroy(ImmRenderer* renderer) {
assert(renderer);
assert(renderer->gfxcore);
if (renderer->triangles) {
gfx_destroy_geometry(renderer->gfxcore, &renderer->triangles);
// TODO: Could also destroy the geometry's buffers here.
}
if (renderer->shader) {
gfx_destroy_shader_program(renderer->gfxcore, &renderer->shader);
}
}
void gfx_imm_flush(ImmRenderer* renderer) {
assert(renderer);
if (renderer->num_triangle_verts > 0) {
gfx_update_geometry(
renderer->triangles,
&(GeometryDesc){
.num_verts = renderer->num_triangle_verts,
.positions3d = (BufferView3d){
.data = renderer->triangle_verts,
.size_bytes = renderer->num_triangle_verts * sizeof(vec3)}
});
gfx_llr_render_geometry(renderer->llr, renderer->triangles);
renderer->num_triangle_verts = 0;
}
}
void gfx_imm_start(ImmRenderer* renderer) {
assert(renderer);
// Shader uniforms are applied lazily.
// TODO: In the event that gfx_activate_shader_program() activates uniforms
// automatically for convenience, call an overload here that doesn't do so.
// gfx_activate_shader_program(renderer->shader);
gfx_llr_set_shader(renderer->llr, renderer->shader);
}
void gfx_imm_end(ImmRenderer* renderer) {
assert(renderer);
gfx_imm_flush(renderer);
// gfx_deactivate_shader_program(renderer->shader);
gfx_llr_set_shader(renderer->llr, 0);
}
void gfx_imm_draw_triangles(
ImmRenderer* renderer, const vec3 verts[], size_t num_triangles) {
assert(renderer);
assert(verts);
const size_t new_verts = num_triangles * 3;
assert(
renderer->num_triangle_verts + new_verts <
(GFX_IMM_MAX_NUM_TRIANGLES * 3));
memcpy(
renderer->triangle_verts + renderer->num_triangle_verts, verts,
new_verts * sizeof(vec3));
renderer->num_triangle_verts += new_verts;
}
void gfx_imm_draw_triangle(ImmRenderer* renderer, const vec3 verts[3]) {
gfx_imm_draw_triangles(renderer, verts, 1);
}
void gfx_imm_draw_aabb2(ImmRenderer* renderer, aabb2 box) {
assert(renderer);
// clang-format off
const vec3 verts[4] = {
vec3_make(box.min.x, box.min.y, 0), // 3 ---- 2
vec3_make(box.max.x, box.min.y, 0), // | |
vec3_make(box.max.x, box.max.y, 0), // | |
vec3_make(box.min.x, box.max.y, 0)}; // 0 ---- 1
// clang-format on
#define tri(i0, i1, i2) verts[i0], verts[i1], verts[i2]
const vec3 tris[6] = {tri(0, 1, 2), tri(0, 2, 3)};
#undef tri
gfx_imm_draw_triangles(renderer, tris, 2);
}
void gfx_imm_draw_aabb3(ImmRenderer* renderer, aabb3 box) {
assert(renderer);
// clang-format off
const vec3 vertices[8] = {
vec3_make(box.min.x, box.min.y, box.max.z), // 7 ----- 6
vec3_make(box.max.x, box.min.y, box.max.z), // / /|
vec3_make(box.max.x, box.max.y, box.max.z), // 3 ----- 2 |
vec3_make(box.min.x, box.max.y, box.max.z), // | | |
vec3_make(box.min.x, box.min.y, box.min.z), // | 4 ----- 5
vec3_make(box.max.x, box.min.y, box.min.z), // |/ |/
vec3_make(box.max.x, box.max.y, box.min.z), // 0 ----- 1
vec3_make(box.min.x, box.max.y, box.min.z)};
// clang-format on
gfx_imm_draw_box3(renderer, vertices);
}
void gfx_imm_draw_box3(ImmRenderer* renderer, const vec3 vertices[8]) {
assert(renderer);
assert(vertices);
// 7 ----- 6
// / /|
// 3 ----- 2 |
// | | |
// | 4 ----- 5
// |/ |/
// 0 ----- 1
#define tri(i0, i1, i2) vertices[i0], vertices[i1], vertices[i2]
const vec3 tris[36] = {
// Front.
tri(0, 1, 2), tri(0, 2, 3),
// Right.
tri(1, 5, 6), tri(1, 6, 2),
// Back.
tri(5, 4, 7), tri(5, 7, 6),
// Left.
tri(4, 0, 03), tri(4, 3, 7),
// Top.
tri(3, 2, 6), tri(3, 6, 7),
// Bottom.
tri(0, 4, 5), tri(0, 5, 1)};
gfx_imm_draw_triangles(renderer, tris, 12);
}
void gfx_imm_set_colour(ImmRenderer* renderer, vec4 colour) {
assert(renderer);
assert(renderer->shader);
gfx_imm_flush(renderer);
gfx_set_vec4_uniform(renderer->shader, "Colour", colour);
}
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