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

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This commit is contained in:
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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13
Outputs/OpenGL/Primitives/TextureTarget.cpp
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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;
}

3
Outputs/OpenGL/Primitives/TextureTarget.hpp
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@ -31,8 +31,9 @@ class TextureTarget {
@param width The width of target to create.
@param height The height of target to create.
@param texture_unit A texture unit on which to bind the texture.
@param has_stencil_buffer A 1-bit stencil buffer is attached if this is @c true; no stencil buffer is attached otherwise.
*/
TextureTarget(GLsizei width, GLsizei height, GLenum texture_unit, GLint mag_filter);
TextureTarget(GLsizei width, GLsizei height, GLenum texture_unit, GLint mag_filter, bool has_stencil_buffer);
~TextureTarget();
/*!

2
Outputs/OpenGL/ScanTarget.cpp
View File

@ -73,7 +73,7 @@ template <typename T> void ScanTarget::allocate_buffer(const T &array, GLuint &b
}
ScanTarget::ScanTarget() :
unprocessed_line_texture_(LineBufferWidth, LineBufferHeight, UnprocessedLineBufferTextureUnit, GL_LINEAR) {
unprocessed_line_texture_(LineBufferWidth, LineBufferHeight, UnprocessedLineBufferTextureUnit, GL_LINEAR, false) {
// Ensure proper initialisation of the two atomic pointer sets.
read_pointers_.store(write_pointers_);