dusk/archive/src/display/mesh/quad.c

/**
 * Copyright (c) 2025 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "quad.h"
#include "assert/assert.h"
#include "debug/debug.h"

mesh_t QUAD_MESH_SIMPLE;
meshvertex_t QUAD_MESH_SIMPLE_VERTICES[QUAD_VERTEX_COUNT] = {
  { .color = COLOR_WHITE_4B, .uv = { 0.0f, 0.0f }, .pos = { 0.0f, 0.0f, 0.0f } },
  { .color = COLOR_WHITE_4B, .uv = { 1.0f, 0.0f }, .pos = { 1.0f, 0.0f, 0.0f } },
  { .color = COLOR_WHITE_4B, .uv = { 1.0f, 1.0f }, .pos = { 1.0f, 1.0f, 0.0f } },

  { .color = COLOR_WHITE_4B, .uv = { 0.0f, 0.0f }, .pos = { 0.0f, 0.0f, 0.0f } },
  { .color = COLOR_WHITE_4B, .uv = { 1.0f, 1.0f }, .pos = { 1.0f, 1.0f, 0.0f } },
  { .color = COLOR_WHITE_4B, .uv = { 0.0f, 1.0f }, .pos = { 0.0f, 1.0f, 0.0f } }
};

void quadInit() {
  meshInit(
    &QUAD_MESH_SIMPLE,
    QUAD_PRIMITIVE_TYPE,
    QUAD_VERTEX_COUNT,
    QUAD_MESH_SIMPLE_VERTICES
  );
}

void quadBuffer(
  meshvertex_t *vertices,
  const float_t minX,
  const float_t minY,
  const float_t maxX,
  const float_t maxY,
  const color_t color,
  const float_t u0,
  const float_t v0,
  const float_t u1,
  const float_t v1
) {
  const float_t z = 0.0f; // Z coordinate for 2D rendering
  assertNotNull(vertices, "Vertices cannot be NULL");

  // First triangle
  vertices[0].color = color;
  vertices[0].uv[0] = u0;
  vertices[0].uv[1] = v1;
  vertices[0].pos[0] = minX;
  vertices[0].pos[1] = maxY;
  vertices[0].pos[2] = z;

  vertices[1].color = color;
  vertices[1].uv[0] = u1;
  vertices[1].uv[1] = v0;
  vertices[1].pos[0] = maxX;
  vertices[1].pos[1] = minY;
  vertices[1].pos[2] = z;

  vertices[2].color = color;
  vertices[2].uv[0] = u0;
  vertices[2].uv[1] = v0;
  vertices[2].pos[0] = minX;
  vertices[2].pos[1] = minY;
  vertices[2].pos[2] = z;

  // Second triangle
  vertices[3].color = color;
  vertices[3].uv[0] = u0;
  vertices[3].uv[1] = v1;
  vertices[3].pos[0] = minX;
  vertices[3].pos[1] = maxY;
  vertices[3].pos[2] = z;

  vertices[4].color = color;
  vertices[4].uv[0] = u1;
  vertices[4].uv[1] = v1;
  vertices[4].pos[0] = maxX;
  vertices[4].pos[1] = maxY;
  vertices[4].pos[2] = z;

  vertices[5].color = color;
  vertices[5].uv[0] = u1;
  vertices[5].uv[1] = v0;
  vertices[5].pos[0] = maxX;
  vertices[5].pos[1] = minY;
  vertices[5].pos[2] = z;
}

void quadBuffer3D(
  meshvertex_t *vertices,
  const vec3 min,
  const vec3 max,
  const color_t color,
  const vec2 uvMin,
  const vec2 uvMax
) {
  assertNotNull(vertices, "Vertices cannot be NULL");
  assertNotNull(min, "Min vector cannot be NULL");
  assertNotNull(max, "Max vector cannot be NULL");
  assertNotNull(uvMin, "UV Min vector cannot be NULL");
  assertNotNull(uvMax, "UV Max vector cannot be NULL");

  // First triangle
  vertices[0].color = color;
  vertices[0].uv[0] = uvMin[0];
  vertices[0].uv[1] = uvMin[1];
  vertices[0].pos[0] = min[0];
  vertices[0].pos[1] = min[1];
  vertices[0].pos[2] = min[2];

  vertices[1].color = color;
  vertices[1].uv[0] = uvMax[0];
  vertices[1].uv[1] = uvMin[1];
  vertices[1].pos[0] = max[0];
  vertices[1].pos[1] = min[1];
  vertices[1].pos[2] = min[2];

  vertices[2].color = color;
  vertices[2].uv[0] = uvMax[0];
  vertices[2].uv[1] = uvMax[1];
  vertices[2].pos[0] = max[0];
  vertices[2].pos[1] = max[1];
  vertices[2].pos[2] = min[2];

  // Second triangle
  vertices[3].color = color;
  vertices[3].uv[0] = uvMin[0];
  vertices[3].uv[1] = uvMin[1];
  vertices[3].pos[0] = min[0];
  vertices[3].pos[1] = min[1];
  vertices[3].pos[2] = min[2];

  vertices[4].color = color;
  vertices[4].uv[0] = uvMax[0];
  vertices[4].uv[1] = uvMax[1];
  vertices[4].pos[0] = max[0];
  vertices[4].pos[1] = max[1];
  vertices[4].pos[2] = min[2];

  vertices[5].color = color;
  vertices[5].uv[0] = uvMin[0];
  vertices[5].uv[1] = uvMax[1];
  vertices[5].pos[0] = min[0];
  vertices[5].pos[1] = max[1];
  vertices[5].pos[2] = min[2];
}