prog

2026-06-18 20:25:54 -05:00
parent 730a5b2b10
commit 57b2cdb9d1
111 changed files with 865 additions and 3328 deletions
@@ -0,0 +1,106 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "triprism.h"
+#include "assert/assert.h"
+
+mesh_t TRIPRISM_MESH_SIMPLE;
+meshvertex_t TRIPRISM_MESH_SIMPLE_VERTICES[TRIPRISM_VERTEX_COUNT];
+
+errorret_t triPrismInit() {
+  triPrismBuffer(
+    TRIPRISM_MESH_SIMPLE_VERTICES,
+    0.0f, 0.0f,   /* p0: bottom-left */
+    1.0f, 0.0f,   /* p1: bottom-right */
+    0.5f, 1.0f,   /* p2: apex */
+    0.0f, 1.0f    /* minZ, maxZ */
+    #if MESH_ENABLE_COLOR
+      , COLOR_WHITE_4B
+    #endif
+  );
+  errorChain(meshInit(
+    &TRIPRISM_MESH_SIMPLE,
+    TRIPRISM_PRIMITIVE_TYPE,
+    TRIPRISM_VERTEX_COUNT,
+    TRIPRISM_MESH_SIMPLE_VERTICES
+  ));
+  errorOk();
+}
+
+void triPrismBuffer(
+  meshvertex_t *vertices,
+  const float_t x0, const float_t y0,
+  const float_t x1, const float_t y1,
+  const float_t x2, const float_t y2,
+  const float_t minZ,
+  const float_t maxZ
+  #if MESH_ENABLE_COLOR
+    , const color_t color
+  #endif
+) {
+  assertNotNull(vertices, "Vertices cannot be NULL");
+
+  /* Helper macro: write one vertex then advance index. */
+  int32_t vi = 0;
+  #if MESH_ENABLE_COLOR
+    #define PRISM_VERT(px, py, pz, u, v) \
+      vertices[vi].color    = color; \
+      vertices[vi].pos[0]   = (px); \
+      vertices[vi].pos[1]   = (py); \
+      vertices[vi].pos[2]   = (pz); \
+      vertices[vi].uv[0]    = (u);  \
+      vertices[vi].uv[1]    = (v);  \
+      vi++;
+  #else
+    #define PRISM_VERT(px, py, pz, u, v) \
+      vertices[vi].pos[0]   = (px); \
+      vertices[vi].pos[1]   = (py); \
+      vertices[vi].pos[2]   = (pz); \
+      vertices[vi].uv[0]    = (u);  \
+      vertices[vi].uv[1]    = (v);  \
+      vi++;
+  #endif
+
+  /* --- Front face (z = maxZ), CCW from +Z --- */
+  PRISM_VERT(x0, y0, maxZ,  0.0f, 0.0f)
+  PRISM_VERT(x1, y1, maxZ,  1.0f, 0.0f)
+  PRISM_VERT(x2, y2, maxZ,  0.5f, 1.0f)
+
+  /* --- Back face (z = minZ), CCW from -Z (reverse winding) --- */
+  PRISM_VERT(x2, y2, minZ,  0.5f, 1.0f)
+  PRISM_VERT(x1, y1, minZ,  1.0f, 0.0f)
+  PRISM_VERT(x0, y0, minZ,  0.0f, 0.0f)
+
+  /* --- Side face 0: edge p0->p1 --- */
+  PRISM_VERT(x0, y0, minZ,  0.0f, 0.0f)
+  PRISM_VERT(x1, y1, minZ,  1.0f, 0.0f)
+  PRISM_VERT(x1, y1, maxZ,  1.0f, 1.0f)
+
+  PRISM_VERT(x0, y0, minZ,  0.0f, 0.0f)
+  PRISM_VERT(x1, y1, maxZ,  1.0f, 1.0f)
+  PRISM_VERT(x0, y0, maxZ,  0.0f, 1.0f)
+
+  /* --- Side face 1: edge p1->p2 --- */
+  PRISM_VERT(x1, y1, minZ,  0.0f, 0.0f)
+  PRISM_VERT(x2, y2, minZ,  1.0f, 0.0f)
+  PRISM_VERT(x2, y2, maxZ,  1.0f, 1.0f)
+
+  PRISM_VERT(x1, y1, minZ,  0.0f, 0.0f)
+  PRISM_VERT(x2, y2, maxZ,  1.0f, 1.0f)
+  PRISM_VERT(x1, y1, maxZ,  0.0f, 1.0f)
+
+  /* --- Side face 2: edge p2->p0 --- */
+  PRISM_VERT(x2, y2, minZ,  0.0f, 0.0f)
+  PRISM_VERT(x0, y0, minZ,  1.0f, 0.0f)
+  PRISM_VERT(x0, y0, maxZ,  1.0f, 1.0f)
+
+  PRISM_VERT(x2, y2, minZ,  0.0f, 0.0f)
+  PRISM_VERT(x0, y0, maxZ,  1.0f, 1.0f)
+  PRISM_VERT(x2, y2, maxZ,  0.0f, 1.0f)
+
+  #undef PRISM_VERT
+}