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Corrects stencil buffer creation, and edges towards using it for [guaranteed] full-screen decay.

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This commit is contained in:
Thomas Harte 2018-11-18 22:22:43 -05:00
parent 75bc0e451d
commit 97c5ee6c0a
3 changed files with 18 additions and 3 deletions
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4
Outputs/OpenGL/Primitives/TextureTarget.cpp
View File

@ -41,7 +41,10 @@ TextureTarget::TextureTarget(GLsizei width, GLsizei height, GLenum texture_unit,
// Also add a stencil buffer if requested.
if(has_stencil_buffer) {
glGenRenderbuffers(1, &renderbuffer_);
glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer_);
glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX1, expanded_width_, expanded_height_);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, renderbuffer_);
}
// Check for successful construction.
@ -52,6 +55,7 @@ TextureTarget::TextureTarget(GLsizei width, GLsizei height, GLenum texture_unit,
TextureTarget::~TextureTarget() {
glDeleteFramebuffers(1, &framebuffer_);
glDeleteTextures(1, &texture_);
if(renderbuffer_) glDeleteRenderbuffers(1, &renderbuffer_);
if(drawing_vertex_array_) glDeleteVertexArrays(1, &drawing_vertex_array_);
if(drawing_array_buffer_) glDeleteBuffers(1, &drawing_array_buffer_);
}

2
Outputs/OpenGL/Primitives/TextureTarget.hpp
View File

@ -78,7 +78,7 @@ class TextureTarget {
};
private:
GLuint framebuffer_ = 0, texture_ = 0;
GLuint framebuffer_ = 0, texture_ = 0, renderbuffer_ = 0;
GLsizei width_ = 0, height_ = 0;
GLsizei expanded_width_ = 0, expanded_height_ = 0;
GLenum texture_unit_ = 0;

15
Outputs/OpenGL/ScanTarget.cpp
View File

@ -488,10 +488,11 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
}
// Ensure the accumulation buffer is properly sized.
if(!accumulation_texture_ || (!synchronous && (accumulation_texture_->get_width() != output_width || accumulation_texture_->get_height() != output_height))) {
const int proportional_width = (output_height * 4) / 3;
if(!accumulation_texture_ || (!synchronous && (accumulation_texture_->get_width() != proportional_width || accumulation_texture_->get_height() != output_height))) {
std::unique_ptr<OpenGL::TextureTarget> new_framebuffer(
new TextureTarget(
GLsizei(output_width),
GLsizei(proportional_width),
GLsizei(output_height),
AccumulationTextureUnit,
GL_LINEAR,
@ -511,6 +512,12 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
// Bind the accumulation texture.
accumulation_texture_->bind_framebuffer();
glClear(GL_STENCIL_BUFFER_BIT);
// Enable stenciling and ensure spans increment the stencil buffer.
glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_EQUAL, 0, GLuint(-1));
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
// Output all lines except the one currently being worked on.
glBindVertexArray(line_vertex_array_);
@ -518,6 +525,10 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
glEnable(GL_BLEND);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(line_buffer_.size() - 2));
// Clear untouched parts of the display. (TODO: at vertical sync, probably)
full_display_rectangle_.draw(0.0, 0.0, 0.0);
glDisable(GL_STENCIL_TEST);
// Copy the accumulatiion texture to the target (TODO: don't assume framebuffer 0).
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glViewport(0, 0, (GLsizei)output_width, (GLsizei)output_height);