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authorDan Goodliffe <dan@randomdan.homeip.net>2023-04-13 02:10:44 +0100
committerDan Goodliffe <dan@randomdan.homeip.net>2023-04-13 02:10:44 +0100
commit1529d37d585ec38aee475519e444d2718a81fda5 (patch)
tree625216101e75e76a15f96ff43a4dae9d1c0256c4 /gfx/models/texture.cpp
parentFix submitting of integer values via vertex arrays (diff)
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Add TextureAtlas class as an extension of Texture
Diffstat (limited to 'gfx/models/texture.cpp')
-rw-r--r--gfx/models/texture.cpp32
1 files changed, 32 insertions, 0 deletions
diff --git a/gfx/models/texture.cpp b/gfx/models/texture.cpp
index efc76e1..a500fed 100644
--- a/gfx/models/texture.cpp
+++ b/gfx/models/texture.cpp
@@ -85,3 +85,35 @@ Texture::saveNormal(const glTexture & texture, const glm::ivec2 & size, const ch
{
save(texture, GL_BGR, GL_BYTE, size, 3, path, 2);
}
+
+TextureAtlas::TextureAtlas(GLsizei width, GLsizei height, GLuint count) : Texture(width, height, nullptr, {})
+{
+ glBindTexture(GL_TEXTURE_RECTANGLE, m_atlas);
+
+ glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+ glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA16UI, 2, static_cast<GLsizei>(count), 0, GL_RGBA_INTEGER,
+ GL_UNSIGNED_BYTE, nullptr);
+}
+
+void
+TextureAtlas::bind(GLenum unit) const
+{
+ Texture::bind(unit);
+ glActiveTexture(unit + 1);
+ glBindTexture(GL_TEXTURE_RECTANGLE, m_atlas);
+}
+
+GLuint
+TextureAtlas::add(glm::ivec2 position, glm::ivec2 size, void * data, TextureOptions)
+{
+ glTextureSubImage2D(m_texture, 0, position.x, position.y, size.x, size.y, GL_RGBA, GL_UNSIGNED_BYTE, data);
+ struct Material {
+ glm::vec<2, uint16_t> position, size, unused1 {}, unused2 {};
+ } material {position, size};
+ glTextureSubImage2D(m_atlas, 0, 0, static_cast<GLsizei>(used), 2, 1, GL_RGBA_INTEGER, GL_UNSIGNED_SHORT, &material);
+ return ++used;
+}