6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2026-04-21 17:16:44 +00:00
Code Issues Projects Releases Wiki Activity

Mildly reformat; as a refresher as much as anything.

Browse Source
This commit is contained in:
Thomas Harte
2026-01-19 15:54:51 -05:00
parent d0962d194a
commit 6346ab67f9
4 changed files with 181 additions and 101 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Outputs/OpenGL/Primitives/TextureTarget.cpp
+55 -27
View File
@@ -20,10 +20,11 @@ TextureTarget::TextureTarget(
const GLint mag_filter,
const bool has_stencil_buffer
) :
api_(api),
width_(width),
height_(height),
texture_unit_(texture_unit) {
api_(api),
width_(width),
height_(height),
texture_unit_(texture_unit)
{
// Generate and bind a frame buffer.
test_gl(glGenFramebuffers, 1, &framebuffer_);
test_gl(glBindFramebuffer, GL_FRAMEBUFFER, framebuffer_);
@@ -39,7 +40,18 @@ TextureTarget::TextureTarget(
bind_texture();
// Set dimensions and set the user-supplied magnification filter.
test_gl(glTexImage2D, GL_TEXTURE_2D, 0, GL_RGBA, GLsizei(expanded_width_), GLsizei(expanded_height_), 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
test_gl(
glTexImage2D,
GL_TEXTURE_2D,
0,
GL_RGBA,
GLsizei(expanded_width_),
GLsizei(expanded_height_),
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
nullptr
);
test_gl(glTexParameteri, GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter);
test_gl(glTexParameteri, GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
@@ -102,30 +114,30 @@ void TextureTarget::bind_texture() const {
void TextureTarget::draw(const float aspect_ratio, const float colour_threshold) const {
if(!pixel_shader_) {
const char *const vertex_shader =
R"str(
in vec2 texCoord;
in vec2 position;
R"glsl(
in vec2 texCoord;
in vec2 position;
out vec2 texCoordVarying;
out vec2 texCoordVarying;
void main(void) {
texCoordVarying = texCoord;
gl_Position = vec4(position, 0.0, 1.0);
}
)str";
void main(void) {
texCoordVarying = texCoord;
gl_Position = vec4(position, 0.0, 1.0);
}
)glsl";
const char *const fragment_shader =
R"str(
in vec2 texCoordVarying;
R"glsl(
in vec2 texCoordVarying;
uniform sampler2D texID;
uniform float threshold;
uniform sampler2D texID;
uniform float threshold;
out vec4 fragColour;
out vec4 fragColour;
void main(void) {
fragColour = clamp(texture(texID, texCoordVarying), threshold, 1.0);
}
)str";
void main(void) {
fragColour = clamp(texture(texID, texCoordVarying), threshold, 1.0);
}
)glsl";
pixel_shader_ = std::make_unique<Shader>(api_, vertex_shader, fragment_shader);
pixel_shader_->bind();
@@ -142,8 +154,24 @@ void TextureTarget::draw(const float aspect_ratio, const float colour_threshold)
test_gl(glEnableVertexAttribArray, GLuint(tex_coord_attribute));
const GLsizei vertex_stride = 4 * sizeof(GLfloat);
test_gl(glVertexAttribPointer, GLuint(position_attribute), 2, GL_FLOAT, GL_FALSE, vertex_stride, (void *)0);
test_gl(glVertexAttribPointer, GLuint(tex_coord_attribute), 2, GL_FLOAT, GL_FALSE, vertex_stride, (void *)(2 * sizeof(GLfloat)));
test_gl(
glVertexAttribPointer,
GLuint(position_attribute),
2,
GL_FLOAT,
GL_FALSE,
vertex_stride,
(void *)0
);
test_gl(
glVertexAttribPointer,
GLuint(tex_coord_attribute),
2,
GL_FLOAT,
GL_FALSE,
vertex_stride,
(void *)(2 * sizeof(GLfloat))
);
const GLint texIDUniform = pixel_shader_->get_uniform_location("texID");
test_gl(glUniform1i, texIDUniform, GLint(texture_unit_ - GL_TEXTURE0));
@@ -166,8 +194,8 @@ void TextureTarget::draw(const float aspect_ratio, const float colour_threshold)
buffer[15] = buffer[7];
// determine positions; rule is to keep the same height and centre
float internal_aspect_ratio = float(width_) / float(height_);
float aspect_ratio_ratio = internal_aspect_ratio / aspect_ratio;
const float internal_aspect_ratio = float(width_) / float(height_);
const float aspect_ratio_ratio = internal_aspect_ratio / aspect_ratio;
buffer[0] = -aspect_ratio_ratio; buffer[1] = -1.0f;
buffer[4] = -aspect_ratio_ratio; buffer[5] = 1.0f;