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font: render 1 glyph

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This commit is contained in:
Zack Buhman 2026-01-06 19:45:52 -06:00
parent 5a97b0ba7e
commit 16f2ee8a1e
5 changed files with 106 additions and 14 deletions
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29
font.fx
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@ -1,25 +1,48 @@
float2 vInvScreenSize;
float2 vPosition;
float2 vGlyphScale;
float2 vCharCoord;
float2 vTexScale;
Texture2D txDiffuse;
SamplerState samPoint {
Filter = MIN_MAG_MIP_POINT;
AddressU = Wrap;
AddressV = Wrap;
};
struct VS_INPUT
{
float4 Pos : POSITION;
float2 Pos : POSITION;
};
struct PS_INPUT
{
float4 Pos : SV_POSITION;
float2 Tex : TEXCOORD0;
};
PS_INPUT VS(VS_INPUT input)
{
PS_INPUT output = (PS_INPUT)0;
output.Pos = input.Pos;
float2 Pos = input.Pos * vGlyphScale + vPosition;
Pos = Pos * vInvScreenSize + float2(-1, 1);
output.Pos = float4(Pos.xy, 0, 1);
float2 Tex = float2(input.Pos.x, -input.Pos.y);
output.Tex = (Tex + vCharCoord) * vTexScale;
return output;
}
float4 PS(PS_INPUT input) : SV_Target
{
return float4(1, 1, 1, 1);
float4 texColor = txDiffuse.Sample(samPoint, input.Tex);
float c = texColor.x == 0 ? 0.0 : 1.0;
return float4(c, c, c, 1);
}
technique10 Font

2
include/render_state.hpp
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@ -4,6 +4,8 @@
HRESULT LoadTexture(const wchar_t * resourceName,
const int width,
const int height,
const int pitch,
const DXGI_FORMAT format,
ID3D10ShaderResourceView ** pTextureShaderResourceView);
#endif _RENDER_STATE_HPP_

1
main.rc
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@ -1,3 +1,4 @@
RES_MAIN_FXO RCDATA "main.fxo"
RES_FONT_FXO RCDATA "font.fxo"
RES_ROBOT_PLAYER RCDATA "robot_player.data"
RES_FONT_TERMINUS_6X12 RCDATA "font/terminus_128x64_6x12.data"

77
src/main.cpp
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@ -52,7 +52,13 @@ ID3D10EffectTechnique * g_pTechniqueFont = NULL;
ID3D10InputLayout * g_pVertexLayoutFont = NULL;
const DWORD g_dwVertexBufferCountFont = 1;
ID3D10Buffer * g_pVertexBuffersFont[g_dwVertexBufferCountFont];
ID3D10ShaderResourceView * g_pTextureShaderResourceViewFont = NULL;
ID3D10EffectVectorVariable * g_pInvScreenSizeVariableFont = NULL;
ID3D10EffectVectorVariable * g_pPositionVariableFont = NULL;
ID3D10EffectVectorVariable * g_pGlyphScaleVariableFont = NULL;
ID3D10EffectVectorVariable * g_pCharCoordVariableFont = NULL;
ID3D10EffectVectorVariable * g_pTexScaleVariableFont = NULL;
ID3D10EffectShaderResourceVariable * g_pDiffuseVariableFont = NULL;
HRESULT InitWindow(HINSTANCE hInstance, int nCmdShow);
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
@ -66,6 +72,22 @@ struct WindowSize {
UINT Height;
};
struct FontSize {
struct {
UINT Width;
UINT Height;
} Glyph;
struct {
UINT Width;
UINT Height;
} Texture;
};
const FontSize g_FontSize = {
{ 6, 12 },
{ 128, 64 },
};
WindowSize g_ViewportSize;
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)
@ -323,7 +345,23 @@ HRESULT LoadMesh()
// textures
//////////////////////////////////////////////////////////////////////
hr = LoadTexture(L"RES_ROBOT_PLAYER", 64, 64, &g_pTextureShaderResourceView);
hr = LoadTexture(L"RES_ROBOT_PLAYER",
64, // width
64, // height
64 * 4, // pitch
DXGI_FORMAT_R8G8B8A8_UNORM,
&g_pTextureShaderResourceView);
if (FAILED(hr)) {
print("LoadTexture\n");
return hr;
}
hr = LoadTexture(L"RES_FONT_TERMINUS_6X12",
g_FontSize.Texture.Width, // width
g_FontSize.Texture.Height, // height
g_FontSize.Texture.Width * 1, // pitch
DXGI_FORMAT_R8_UNORM,
&g_pTextureShaderResourceViewFont);
if (FAILED(hr)) {
print("LoadTexture\n");
return hr;
@ -337,9 +375,10 @@ struct FontVertex {
};
const FontVertex FontVertices[] = {
D3DXVECTOR2( 0.0f, 0.5f),
D3DXVECTOR2( 0.5f, -0.5f),
D3DXVECTOR2(-0.5f, -0.5f),
D3DXVECTOR2( 0.0f, 0.0f), // -- top right
D3DXVECTOR2( 1.0f, 0.0f), // -- top left
D3DXVECTOR2( 0.0f, -1.0f), // -- bottom right
D3DXVECTOR2( 1.0f, -1.0f), // -- bottom left
};
HRESULT InitFontBuffers()
@ -371,6 +410,12 @@ HRESULT InitFontBuffers()
}
g_pTechniqueFont = g_pEffectFont->GetTechniqueByName("Font");
g_pInvScreenSizeVariableFont = g_pEffectFont->GetVariableByName("vInvScreenSize")->AsVector();
g_pPositionVariableFont = g_pEffectFont->GetVariableByName("vPosition")->AsVector();
g_pGlyphScaleVariableFont = g_pEffectFont->GetVariableByName("vGlyphScale")->AsVector();
g_pCharCoordVariableFont = g_pEffectFont->GetVariableByName("vCharCoord")->AsVector();
g_pTexScaleVariableFont = g_pEffectFont->GetVariableByName("vTexScale")->AsVector();
g_pDiffuseVariableFont = g_pEffectFont->GetVariableByName("txDiffuse")->AsShaderResource();
//////////////////////////////////////////////////////////////////////
// layout
@ -854,20 +899,38 @@ void RenderModel(float t)
void RenderFont()
{
D3DXVECTOR2 invScreenSize = D3DXVECTOR2(2.0f / (float)g_ViewportSize.Width,
2.0f / (float)g_ViewportSize.Height);
D3DXVECTOR2 position = D3DXVECTOR2(6, 0);
D3DXVECTOR2 glyphScale = D3DXVECTOR2((float)g_FontSize.Glyph.Width,
(float)g_FontSize.Glyph.Height);
D3DXVECTOR2 charCoord = D3DXVECTOR2(16, 0);
D3DXVECTOR2 texScale = D3DXVECTOR2(glyphScale.x / (float)g_FontSize.Texture.Width,
glyphScale.y / (float)g_FontSize.Texture.Height);
g_pInvScreenSizeVariableFont->SetFloatVector((float *)&invScreenSize);
g_pPositionVariableFont->SetFloatVector((float *)&position);
g_pGlyphScaleVariableFont->SetFloatVector((float *)&glyphScale);
g_pCharCoordVariableFont->SetFloatVector((float *)&charCoord);
g_pTexScaleVariableFont->SetFloatVector((float *)&texScale);
g_pDiffuseVariableFont->SetResource(g_pTextureShaderResourceViewFont);
UINT stride[] = {
(sizeof (FontVertex)),
};
UINT offset[] = { 0 };
g_pd3dDevice->IASetInputLayout(g_pVertexLayoutFont);
g_pd3dDevice->IASetVertexBuffers(0, g_dwVertexBufferCountFont, g_pVertexBuffersFont, stride, offset);
g_pd3dDevice->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
g_pd3dDevice->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
D3D10_TECHNIQUE_DESC techDesc;
g_pTechniqueFont->GetDesc(&techDesc);
for (UINT p = 0; p < techDesc.Passes; p++) {
g_pTechniqueFont->GetPassByIndex(p)->Apply(0);
g_pd3dDevice->Draw(3, 0);
g_pd3dDevice->Draw(4, 0);
}
}

9
src/render_state.cpp
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@ -11,6 +11,8 @@
HRESULT LoadTexture(const wchar_t * resourceName,
const int width,
const int height,
const int pitch,
const DXGI_FORMAT format,
ID3D10ShaderResourceView ** pTextureShaderResourceView)
{
HRESULT hr;
@ -22,18 +24,19 @@ HRESULT LoadTexture(const wchar_t * resourceName,
return -1;
}
DWORD dwResourceSize = SizeofResource(NULL, hRobotPlayerRes);
assert(width * height * 4 == dwResourceSize);
assert(pitch >= width);
assert(pitch * height == dwResourceSize);
HGLOBAL hRobotPlayerData = LoadResource(NULL, hRobotPlayerRes);
D3D10_SUBRESOURCE_DATA subresourceData;
subresourceData.pSysMem = LockResource(hRobotPlayerData);
subresourceData.SysMemPitch = width * 4;
subresourceData.SysMemPitch = pitch;
D3D10_TEXTURE2D_DESC textureDesc;
textureDesc.Width = width;
textureDesc.Height = height;
textureDesc.MipLevels = 1;
textureDesc.ArraySize = 1;
textureDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
textureDesc.Format = format;
textureDesc.SampleDesc.Count = 1;
textureDesc.SampleDesc.Quality = 0;
textureDesc.Usage = D3D10_USAGE_DEFAULT;