From 1529d37d585ec38aee475519e444d2718a81fda5 Mon Sep 17 00:00:00 2001 From: Dan Goodliffe Date: Thu, 13 Apr 2023 02:10:44 +0100 Subject: Add TextureAtlas class as an extension of Texture --- gfx/models/texture.cpp | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'gfx/models/texture.cpp') 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(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(used), 2, 1, GL_RGBA_INTEGER, GL_UNSIGNED_SHORT, &material); + return ++used; +} -- cgit v1.2.3