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//~ Functions
internal void
RenderBuildAtlas(arena *Arena,
font_atlas *Atlas,
font *TextFont,
font *IconsFont,
f32 HeightPx)
{
if(TextFont->Initialized)
{
Atlas->FirstCodepoint = ' ';
// NOTE(luca): 2 bytes =>small alphabets.
Atlas->CodepointsCount = ((0xFFFF - 1) - Atlas->FirstCodepoint);
Atlas->IconsFirstCodepoint = 'a';
Atlas->IconsCodepointsCount = 2;
Atlas->Width = KB(1);
Atlas->Height = KB(2);
u64 Size = (u64)(Atlas->Width*Atlas->Height);
Arena->Pos = 0;
Atlas->Data = PushArray(Arena, u8, Size);
s32 CodepointsCount = (Atlas->CodepointsCount + Atlas->IconsCodepointsCount);
Atlas->PackedChars = PushArray(Arena, stbtt_packedchar, (u64)CodepointsCount);
Atlas->AlignedQuads = PushArray(Arena, stbtt_aligned_quad, (u64)CodepointsCount);
Atlas->HeightPx = HeightPx;
Atlas->FontScale = stbtt_ScaleForPixelHeight(&TextFont->Info, HeightPx);
Atlas->Font = TextFont;
stbtt_pack_context Ctx;
{
stbtt_PackBegin(&Ctx,
Atlas->Data,
Atlas->Width, Atlas->Height,
0, 1, 0);
stbtt_PackFontRange(&Ctx, TextFont->Info.data, 0, HeightPx,
Atlas->FirstCodepoint, Atlas->CodepointsCount,
Atlas->PackedChars);
// Icons
{
// NOTE(luca): We need to scale this so that it matches our font.
f32 TextEmHeight = (f32)(TextFont->Ascent - TextFont->Descent);
f32 IconsEmHeight = (f32)(IconsFont->Ascent - IconsFont->Descent);
f32 ScaledHeight = HeightPx*(IconsEmHeight/TextEmHeight);
stbtt_PackFontRange(&Ctx, IconsFont->Info.data, 0, ScaledHeight,
Atlas->IconsFirstCodepoint, Atlas->IconsCodepointsCount,
Atlas->PackedChars + Atlas->CodepointsCount);
}
stbtt_PackEnd(&Ctx);
}
for EachIndex(Idx, CodepointsCount)
{
float UnusedX, UnusedY;
stbtt_GetPackedQuad(Atlas->PackedChars, Atlas->Width, Atlas->Height,
Idx,
&UnusedX, &UnusedY,
&Atlas->AlignedQuads[Idx], 0);
}
}
}
internal rect_instance *
DrawRect(v4 Dest, v4 Color, f32 CornerRadius, f32 BorderThickness, f32 Softness)
{
rect_instance *Result = GlobalRectsInstances + GlobalRectsCount;
GlobalRectsCount += 1;
MemoryZero(Result);
Result->Dest = Dest;
Result->Color0 = Color;
Result->Color1 = Color;
Result->Color2 = Color;
Result->Color3 = Color;
Result->CornerRadii.e[0] = CornerRadius;
Result->CornerRadii.e[1] = CornerRadius;
Result->CornerRadii.e[2] = CornerRadius;
Result->CornerRadii.e[3] = CornerRadius;
Result->Border = BorderThickness;
Result->Softness = Softness;
return Result;
}
internal rect_instance *
DrawRectChar(font_atlas *Atlas, v2 Pos, rune Codepoint, v4 Color)
{
rect_instance *Result = 0;
v4 Dest = {0};
// NOTE(luca): Evereything happens in pixel coordinates in here.
b32 Supported = (Codepoint >= Atlas->FirstCodepoint &&
Codepoint < Atlas->CodepointsCount - Atlas->FirstCodepoint);
if(1 || Supported)
{
rune CharIdx = Codepoint - Atlas->FirstCodepoint;
stbtt_packedchar *PackedChar = &Atlas->PackedChars[CharIdx];
stbtt_aligned_quad *Quad = &Atlas->AlignedQuads[CharIdx];
f32 Width = (PackedChar->x1 - PackedChar->x0);
f32 Height = (PackedChar->y1 - PackedChar->y0);
{
v2 Min = Pos;
// TODO(luca): Looks off, maybe rounding is incorrect, investigate...
Min.X += (PackedChar->xoff);
f32 Baseline = GetBaseline(Atlas->Font, Atlas->FontScale);
f32 Descent = (f32)Atlas->Font->Descent*Atlas->FontScale;
Min.Y += (PackedChar->yoff) + Baseline + Descent;
v2 Max = V2(Min.X + Width, Min.Y + Height);
Result = DrawRect(Dest, Color, 0.f, 0.f, 0.f);
Result->Dest = Rect(Min.X, Min.Y, Max.X, Max.Y);
Result->TexSrc = Rect(Quad->s0, Quad->t0, Quad->s1, Quad->t1);
}
Result->HasTexture = true;
#if 0
DrawRect(Result->Dest, V4(0.f, 0.f, 1.f, 1.f), 0.f, 1.f, 0.f);
#endif
}
return Result;
}
internal void
RenderInit(gl_render_state *Render)
{
glGenVertexArrays(ArrayCount(Render->VAOs), &Render->VAOs[0]);
glGenTextures(ArrayCount(Render->Textures), &Render->Textures[0]);
glGenBuffers(ArrayCount(Render->VBOs), &Render->VBOs[0]);
glBindVertexArray(Render->VAOs[0]);
glBindBuffer(GL_ARRAY_BUFFER, Render->VBOs[0]);
}
internal void
RenderCleanup(gl_render_state *Render)
{
glDeleteVertexArrays(ArrayCount(Render->VAOs), &Render->VAOs[0]);
glDeleteTextures(ArrayCount(Render->Textures), &Render->Textures[0]);
glDeleteBuffers(ArrayCount(Render->VBOs), &Render->VBOs[0]);
glDeleteProgram(Render->RectShader);
}
internal void
RenderBeginFrame(arena *Arena, s32 Width, s32 Height)
{
glViewport(0, 0, Width, Height);
GlobalRectsCount = 0;
GlobalRectsInstances = PushArray(Arena, rect_instance, MaxRectsCount);
GL_FrameArena = Arena;
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
}
internal void
RenderClear(void)
{
glClearColor(U32ToV4Arg(0xFF2E3440));
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
internal void
RenderDrawAllRectangles(gl_render_state *Render, v2 BufferDim, font_atlas *Atlas)
{
if(!Render->ShadersCompiled)
{
gl_uint RectShader = Render->RectShader;
glDeleteProgram(RectShader);
RectShader = GL_ProgramFromShaders(S8("../code/editor/generated/rect_vert.glsl"),
S8("../code/editor/generated/rect_frag.glsl"));
glUseProgram(RectShader);
GL_LoadTextureFromImage(Render->Textures[0], Atlas->Width, Atlas->Height, Atlas->Data, GL_RED, RectShader, "Texture");
// Uniforms
{
gl_int UViewport = glGetUniformLocation(RectShader, "Viewport");
glUniform2f(UViewport, V2Arg(BufferDim));
}
Render->RectShader = RectShader;
Render->ShadersCompiled = true;
}
#if EDITOR_HOT_RELOAD_SHADERS
Render->ShadersCompiled = false;
#endif
Assert(GlobalRectsCount < MaxRectsCount);
u64 Size = GlobalRectsCount*sizeof(rect_instance);
glBufferData(GL_ARRAY_BUFFER, (s32)Size, GlobalRectsInstances, GL_STATIC_DRAW);
u64 Offset = 0;
s32 TotalSize = 0;
for EachElement(Idx, RectVSAttribOffsets)
{
u64 Count = (u64)RectVSAttribOffsets[Idx];
glEnableVertexAttribArray((gl_uint)Idx);
glVertexAttribDivisor((gl_uint)Idx, 1);
glVertexAttribPointer((gl_uint)Idx, (gl_int)Count, GL_FLOAT, false, sizeof(rect_instance), (void *)((Offset)*sizeof(f32)));
Offset += Count;
TotalSize += RectVSAttribOffsets[Idx];
}
Assert(TotalSize == (sizeof(rect_instance)/sizeof(f32)));
glEnable(GL_MULTISAMPLE);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, (gl_int)GlobalRectsCount);
}
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