82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
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#include "twn_rendering_c.h"
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#include "twn_context.h"
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#include "twn_textures_c.h"
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#include "twn_rendering_platform.h"
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#include <stb_ds.h>
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/* TODO: automatic handling of repeating textures */
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/* for that we could allocate a loner texture */
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void unfurl_triangle(const char *path,
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t_fvec3 v0,
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t_fvec3 v1,
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t_fvec3 v2,
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t_shvec2 uv0,
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t_shvec2 uv1,
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t_shvec2 uv2)
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{
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const t_texture_key texture_key = textures_get_key(&ctx.texture_cache, path);
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struct mesh_batch_item *batch_p = hmgetp_null(ctx.uncolored_mesh_batches, texture_key);
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if (!batch_p) {
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struct mesh_batch item = {0};
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hmput(ctx.uncolored_mesh_batches, texture_key, item);
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batch_p = &ctx.uncolored_mesh_batches[hmlenu(ctx.uncolored_mesh_batches) - 1]; /* TODO: can last index be used? */
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}
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union uncolored_space_triangle triangle = { .primitive = {
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.v0 = v0,
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.v1 = v1,
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.v2 = v2,
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.uv1 = m_to_fvec2(uv1),
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.uv0 = m_to_fvec2(uv0),
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.uv2 = m_to_fvec2(uv2),
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}};
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union uncolored_space_triangle *triangles = (union uncolored_space_triangle *)batch_p->value.primitives;
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arrpush(triangles, triangle);
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batch_p->value.primitives = (uint8_t *)triangles;
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}
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void draw_uncolored_space_traingle_batch(struct mesh_batch *batch,
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t_texture_key texture_key)
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{
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static vertex_buffer vertex_array = 0;
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if (vertex_array == 0)
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vertex_array = create_vertex_buffer();
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const size_t primitives_len = arrlenu(batch->primitives);
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/* nothing to do */
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if (primitives_len == 0)
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return;
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const t_frect srcrect = textures_get_srcrect(&ctx.texture_cache, texture_key);
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const t_frect dims = textures_get_dims(&ctx.texture_cache, texture_key);
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const float wr = srcrect.w / dims.w;
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const float hr = srcrect.h / dims.h;
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const float xr = srcrect.x / dims.w;
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const float yr = srcrect.y / dims.h;
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/* update pixel-based uvs to correspond with texture atlases */
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for (size_t i = 0; i < primitives_len; ++i) {
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struct uncolored_space_triangle_payload *payload =
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&((union uncolored_space_triangle *)batch->primitives)[i].payload;
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payload->uv0.x = xr + ((float)payload->uv0.x / srcrect.w) * wr;
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payload->uv0.y = yr + ((float)payload->uv0.y / srcrect.h) * hr;
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payload->uv1.x = xr + ((float)payload->uv1.x / srcrect.w) * wr;
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payload->uv1.y = yr + ((float)payload->uv1.y / srcrect.h) * hr;
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payload->uv2.x = xr + ((float)payload->uv2.x / srcrect.w) * wr;
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payload->uv2.y = yr + ((float)payload->uv2.y / srcrect.h) * hr;
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}
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specify_vertex_buffer(vertex_array, batch->primitives, primitives_len * sizeof (struct uncolored_space_triangle_payload));
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finally_draw_uncolored_space_traingle_batch(batch, texture_key, vertex_array);
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}
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