From a9acc9051c601202aad71c53d8afb2cc9e7c1768 Mon Sep 17 00:00:00 2001
From: talha <sarcxd@gmail.com>
Date: Sun, 23 Feb 2025 14:47:14 +0500
Subject: Refactored font rendering functionality
---
source/main.cpp | 283 ++++----------------------------------------------------
1 file changed, 19 insertions(+), 264 deletions(-)
(limited to 'source/main.cpp')
diff --git a/source/main.cpp b/source/main.cpp
index 924286c..437f52f 100755
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -85,8 +85,8 @@ enum PlatformKey {
struct TextChar {
s64 lsb;
s64 advance;
- Vec2 box0;
- Vec2 box1;
+ Vec2 bbox0;
+ Vec2 bbox1;
Vec2 size;
};
@@ -101,8 +101,8 @@ struct TextState {
u32 vao;
u32 vbo;
u32 chunk_size;
- IVec2 box0;
- IVec2 box1;
+ IVec2 bbox0;
+ IVec2 bbox1;
stbtt_fontinfo font;
s32* char_indexes;
Mat4* transforms;
@@ -662,9 +662,10 @@ int main(int argc, char* argv[])
size_t fsize = 0;
unsigned char *font_buffer = (unsigned char*)SDL_LoadFile("./assets/fonts/Roboto.ttf", &fsize);
stbtt_InitFont(&renderer.ui_text.font, font_buffer, 0);
- renderer.ui_text.pixel_size = 32*render_scale;
+
renderer.ui_text.sp = ui_text_sp;
- renderer.ui_text.chunk_size = 32;
+ renderer.ui_text.chunk_size = 128;
+ renderer.ui_text.pixel_size = 32*render_scale;
renderer.ui_text.transforms = (Mat4*)malloc(
renderer.ui_text.chunk_size*sizeof(Mat4)
);
@@ -675,133 +676,7 @@ int main(int argc, char* argv[])
128*sizeof(TextChar)
);
- // setup_text
- TextState *uistate = &(renderer.ui_text);
-
- uistate->scale = stbtt_ScaleForPixelHeight(&uistate->font, uistate->pixel_size);
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-
- glGenTextures(1, &(uistate->texture_atlas_id));
- glBindTexture(GL_TEXTURE_2D_ARRAY, uistate->texture_atlas_id);
-
- // generate texture
- glTexImage3D(
- GL_TEXTURE_2D_ARRAY,
- 0,
- GL_R8,
- uistate->pixel_size,
- uistate->pixel_size,
- 128,
- 0,
- GL_RED,
- GL_UNSIGNED_BYTE,
- 0);
-
- s32 ascent, descent, linegap = 0;
- stbtt_GetFontVMetrics(&uistate->font, &ascent, &descent, &linegap);
- uistate->ascent = ascent;
- uistate->descent = descent;
- uistate->linegap = linegap;
- s32 x0, y0, x1, y1 = 0;
-
- stbtt_GetFontBoundingBox(&uistate->font, &x0, &y0, &x1, &y1);
- uistate->box0 = IVec2{x0, y0};
- uistate->box1 = IVec2{x1, y1};
-
- u32 pixel_size = uistate->pixel_size;
- unsigned char *bitmap_buffer = (unsigned char*)calloc(pixel_size * pixel_size, sizeof(unsigned char));
- for (u32 c = 0; c < 128; c++)
- {
- // @resume: working on replicating the
- // freetype gl_setup_text function
- s32 advance, lsb = 0;
- stbtt_GetCodepointHMetrics(&uistate->font, c, &advance, &lsb);
- s32 bx0, bx1, by0, by1 = 0;
- stbtt_GetCodepointBitmapBox(
- &uistate->font, c,
- uistate->scale, uistate->scale,
- &bx0, &by0,
- &bx1, &by1
- );
-
- s32 width = bx1 - bx0;
- s32 height = by1 - by0;
-
- stbtt_MakeCodepointBitmap(
- &uistate->font,
- bitmap_buffer,
- width,
- height,
- width,
- uistate->scale,
- uistate->scale,
- c);
-
- glTexSubImage3D(
- GL_TEXTURE_2D_ARRAY,
- 0,
- 0, 0, // x, y offset
- int(c),
- width,
- height,
- 1,
- GL_RED,
- GL_UNSIGNED_BYTE,
- bitmap_buffer
- );
- // set texture options
- glTexParameteri(
- GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE
- );
- glTexParameteri(
- GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE
- );
- glTexParameteri(
- GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR
- );
- glTexParameteri(
- GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR
- );
-
- TextChar tc;
- tc.size = Vec2{
- (r32)width, (r32)height
- };
- tc.box0 = Vec2{
- (r32)bx0, (r32)by0
- };
- tc.box1 = Vec2{
- (r32)bx1, (r32)by1
- };
- tc.advance = advance;
- tc.lsb = (s32)lsb;
- uistate->char_map[c] = tc;
- }
-
- glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
-
- r32 vertices[] = {
- 0.0f, 1.0f,
- 0.0f, 0.0f,
- 1.0f, 1.0f,
- 1.0f, 0.0f
- };
-
- glGenVertexArrays(1, &(uistate->vao));
- glGenBuffers(1, &(uistate->vbo));
-
- glBindVertexArray(uistate->vao);
- glBindBuffer(GL_ARRAY_BUFFER, uistate->vbo);
- glBufferData(
- GL_ARRAY_BUFFER,
- sizeof(vertices),
- vertices,
- GL_STATIC_DRAW);
-
- glEnableVertexAttribArray(0);
- glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
- glBindBuffer(GL_ARRAY_BUFFER, 0);
- glBindVertexArray(0);
+ gl_setup_text(&renderer.ui_text);
}
@@ -1635,7 +1510,6 @@ int main(int argc, char* argv[])
gl_line_flush(&renderer);
}
-#if 0
// render_entities
for (int i = 0; i < state.game_level.entity_count; i++) {
Entity entity = state.game_level.entities[i];
@@ -1654,114 +1528,19 @@ int main(int argc, char* argv[])
}
gl_cq_flush(&renderer);
-#endif
array_clear(&renderer.cq_pos_batch);
array_clear(&renderer.cq_color_batch);
renderer.cq_batch_count = 0;
- // render ui text
- {
- Vec3 color = Vec3{1.0f, 1.0f, 1.0f};
- // render_text
- glDisable(GL_DEPTH_TEST);
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
- glUseProgram(renderer.ui_text.sp);
- if (renderer.ui_cam_update) {
- glUniformMatrix4fv(
- glGetUniformLocation(
- renderer.ui_text.sp, "View"),
- 1, GL_FALSE, renderer.ui_cam_view.buffer);
- glUniformMatrix4fv(
- glGetUniformLocation(
- renderer.ui_text.sp, "Projection"),
- 1, GL_FALSE, renderer.cam_proj.buffer);
- renderer.ui_cam_update = 0;
- }
- glUniform3fv(
- glGetUniformLocation(
- renderer.ui_text.sp, "TextColor"),
- 1, color.data);
- glBindVertexArray(renderer.ui_text.vao);
- glBindTexture(
- GL_TEXTURE_2D_ARRAY,
- renderer.ui_text.texture_atlas_id);
- glBindBuffer(GL_ARRAY_BUFFER, renderer.ui_text.vbo);
- glActiveTexture(GL_TEXTURE0);
-
- u32 running_index = 0;
- r32 startx = 0.0f;
- r32 starty = 0.0f;
- r32 linex = startx;
- r32 font_size = 32.0f;
- r32 render_scale = font_size/renderer.ui_text.pixel_size;
- r32 scale = renderer.ui_text.scale*font_size/renderer.ui_text.pixel_size;
- memset(
- renderer.ui_text.transforms,
- 0,
- renderer.ui_text.chunk_size);
- memset(
- renderer.ui_text.char_indexes,
- 0,
- renderer.ui_text.chunk_size);
- char *text = "qhick brown jumps over lazy dog";
- char *char_iter = text;
- r32 baseline = -renderer.ui_text.box0.y*scale - font_size;
- while (*char_iter != '\0') {
- TextChar render_char = renderer.ui_text.char_map[*char_iter];
- r32 xpos = linex + (scale * render_char.lsb);
- r32 ypos = starty + (baseline - render_scale*render_char.box0.y);
-
- Mat4 sc = scaling_matrix4m(font_size, font_size, 1.0f);
- Mat4 tr = translation_matrix4m(xpos, ypos, 0);
- Mat4 model = multiply4m(tr, sc);
- renderer.ui_text.transforms[running_index] = model;
- renderer.ui_text.char_indexes[running_index] =
- int(*char_iter);
-
- linex += (scale * render_char.advance);
- char prev_char = *char_iter;
- char_iter++;
- char curr_char = *char_iter;
-
- if (curr_char) {
- s32 kern = scale * stbtt_GetCodepointKernAdvance(&renderer.ui_text.font, prev_char, curr_char);
- linex += kern;
- }
- running_index++;
- }
- u32 render_count = running_index;
- r32 transform_loc = glGetUniformLocation(
- renderer.ui_text.sp, "LetterTransforms");
- glUniformMatrix4fv(
- transform_loc,
- render_count,
- GL_FALSE,
- &(renderer.ui_text.transforms[0].buffer[0])
- );
- r32 texture_map_loc = glGetUniformLocation(
- renderer.ui_text.sp, "TextureMap");
- glUniform1iv(
- texture_map_loc,
- render_count,
- renderer.ui_text.char_indexes);
- glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, render_count);
- running_index = 0;
- memset(renderer.ui_text.transforms, 0, render_count);
- memset(renderer.ui_text.char_indexes, 0, render_count);
- }
-
-#if FREETYPE
char level_state_output[50];
sprintf(level_state_output, "is level clear = %d", state.level_state);
gl_render_text(
&renderer,
level_state_output,
Vec2{600.0f, 900.0f},
- 28.0f,
- Vec3{0.0f, 0.0f, 0.0f});
+ Vec3{0.0f, 0.0f, 0.0f},
+ 32.0f);
if (is_collide_x || is_collide_y)
@@ -1769,58 +1548,34 @@ int main(int argc, char* argv[])
gl_render_text(&renderer,
"is colliding",
Vec2{500.0f, 700.0f}, // position
- 28.0f, // size
- Vec3{0.0f, 0.0f, 0.0f}); // color
-
- char movedir_output[50];
- sprintf(movedir_output, "move_dir = %f", p_move_dir.x);
- gl_render_text(&renderer,
- movedir_output,
- Vec2{500.0f, 60.0f}, // position
- 28.0f, // size
- Vec3{0.0f, 0.0f, 0.0f}); // color
-
- char speed_output[50];
- sprintf(speed_output, "%f pps", state.player_velocity.x);
- gl_render_text(&renderer,
- speed_output,
- Vec2{500.0f, 100.0f}, // position
- 28.0f, // size
- Vec3{0.0f, 0.0f, 0.0f}); // color
+ Vec3{0.0f, 0.0f, 0.0f}, // color
+ 28.0f); // size
}
char fmt_buffer[50];
-
sprintf(fmt_buffer, "frametime: %f", timer.tDelta);
gl_render_text(&renderer,
fmt_buffer,
Vec2{900.0f, 90.0f}, // position
- 28.0f*render_scale, // size
- Vec3{0.0f, 0.0f, 0.0f}); // color
+ Vec3{0.0f, 0.0f, 0.0f},
+ 28.0f*render_scale); // color
- //sprintf(fmt_buffer, "inside_teleporter: %d\nteleporting: %d", state.inside_teleporter, state.teleporting);
- //gl_render_text(&renderer,
- // fmt_buffer,
- // Vec2{900.0f, 190.0f}, // position
- // 28.0f*render_scale, // size
- // Vec3{0.0f, 0.0f, 0.0f}); // color
-
sprintf(fmt_buffer, "GridX: %d, GridY: %d", mouse_position_clamped.x, mouse_position_clamped.y);
gl_render_text(
&renderer,
fmt_buffer,
Vec2{0.0f, 0.0f},
- 28.0f*render_scale,
- Vec3{0.0f, 0.0f, 0.0f});
+ Vec3{0.0f, 0.0f, 0.0f},
+ 28.0f*render_scale);
sprintf(fmt_buffer, "WorldMouseX: %d, WorldMouseY: %d", mouse_position_world.x, mouse_position_world.y);
gl_render_text(
&renderer,
fmt_buffer,
Vec2{0.0f, 40.0f},
- 28.0f*render_scale,
- Vec3{0.0f, 0.0f, 0.0f});
-#endif
+ Vec3{0.0f, 0.0f, 0.0f},
+ 28.0f*render_scale);
+
SDL_GL_SwapWindow(window);
--
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