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Add configuration option for ghost reset distance. Improve documentation.

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cowley
2025-12-20 17:12:58 -05:00
parent faf3f239d8
commit 7a3705d342
25 changed files with 132 additions and 28 deletions
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22
text.cpp
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@@ -5,13 +5,16 @@
#include "text.h"
#include "shader.h"
// Global freetype context shared across text rendering.
FT_Library ft;
FT_Face face;
// Uniform key for tinting glyphs.
const char *textcolorC = "textColor";
unsigned int textVAO, textVBO;
unsigned int textVAO, textVBO; // shared quad mesh for all HUD strings
// Glyph metadata + GL texture for a single character.
struct character_t {
unsigned int texture_id;
glm::ivec2 size;
@@ -19,8 +22,10 @@ struct character_t {
unsigned int advance;
};
// ASCII glyph cache keyed by character codepoint.
std::map<char, character_t> glyph_to_character;
// Initialize freetype and bake ASCII glyphs into GL textures for reuse.
int init_text(int *shader) {
if (FT_Init_FreeType(&ft)) {
@@ -33,8 +38,9 @@ int init_text(int *shader) {
return -1;
}
// Bake glyph bitmaps at a fixed pixel height; width is dynamic.
FT_Set_Pixel_Sizes(face, 0, 48);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // allow byte-aligned glyph rows
for (unsigned char c = 0; c < 128; c++) {
@@ -44,6 +50,7 @@ int init_text(int *shader) {
}
unsigned int texture;
// Upload the glyph bitmap into a single-channel texture.
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(
@@ -78,8 +85,7 @@ int init_text(int *shader) {
FT_Done_Face(face);
FT_Done_FreeType(ft);
// configure textVAO/textVBO for texture quads
// -----------------------------------
// Configure buffers for a dynamic quad (two triangles per glyph).
glGenVertexArrays(1, &textVAO);
glGenBuffers(1, &textVBO);
glBindVertexArray(textVAO);
@@ -100,9 +106,10 @@ int init_text(int *shader) {
}
// Draw a string using pre-baked glyph textures at the supplied screen position.
void render_text(int shader, std::string text, float x, float y, float scale, glm::vec3 color) {
set_uniform(shader, textcolorC, color);
set_uniform(shader, textcolorC, color); // apply tint per draw call
glActiveTexture(GL_TEXTURE0);
glBindVertexArray(textVAO);
@@ -116,6 +123,7 @@ void render_text(int shader, std::string text, float x, float y, float scale, gl
float w = ch.size.x * scale;
float h = ch.size.y * scale;
// Each glyph is rendered as a textured quad.
float vertices[24] = {
xpos, ypos + h, 0.0f, 0.0f,
xpos, ypos, 0.0f, 1.0f,
@@ -126,12 +134,12 @@ void render_text(int shader, std::string text, float x, float y, float scale, gl
};
glBindTexture(GL_TEXTURE_2D, ch.texture_id);
glBindBuffer(GL_ARRAY_BUFFER, textVBO);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * (2 + 2) * 6, vertices);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float) * (2 + 2) * 6, vertices); // stream quad verts
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDrawArrays(GL_TRIANGLES, 0, (2 + 2) * 6);
x += (ch.advance >> 6) * scale;
x += (ch.advance >> 6) * scale; // advance is stored in 1/64th pixels
}