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Extends TextureTarget so that targets can be created with a one-bit stencil.

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Thomas Harte
2018-11-17 15:51:12 -05:00
parent 16dfeb3fc8
commit c173777d12
3 changed files with 15 additions and 3 deletions
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Outputs/OpenGL/Primitives/TextureTarget.cpp
+12 -1
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@@ -13,28 +13,39 @@
using namespace Outputs::Display::OpenGL;
TextureTarget::TextureTarget(GLsizei width, GLsizei height, GLenum texture_unit, GLint mag_filter) :
TextureTarget::TextureTarget(GLsizei width, GLsizei height, GLenum texture_unit, GLint mag_filter, bool has_stencil_buffer) :
width_(width),
height_(height),
texture_unit_(texture_unit) {
// Generate and bind a frame buffer.
glGenFramebuffers(1, &framebuffer_);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer_);
// Round the width and height up to the next power of two.
expanded_width_ = 1;
while(expanded_width_ < width) expanded_width_ <<= 1;
expanded_height_ = 1;
while(expanded_height_ < height) expanded_height_ <<= 1;
// Generate a texture and bind it to the nominated texture unit.
glGenTextures(1, &texture_);
bind_texture();
// Upload a blank initial texture and set the user-supplied magnification filter.
std::vector<uint8_t> blank_buffer(static_cast<size_t>(expanded_width_ * expanded_height_ * 4), 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, static_cast<GLsizei>(expanded_width_), static_cast<GLsizei>(expanded_height_), 0, GL_RGBA, GL_UNSIGNED_BYTE, blank_buffer.data());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
// Set the texture as colour attachment 0 on the frame buffer.
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_, 0);
// Also add a stencil buffer if requested.
if(has_stencil_buffer) {
glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX1, expanded_width_, expanded_height_);
}
// Check for successful construction.
if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
throw ErrorFramebufferIncomplete;
}