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The Omega Update(TM) Part 5 (Finishing)

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shweet
2025-08-14 21:39:17 -04:00
parent ea3498692a
commit 4029828d04
24 changed files with 966 additions and 319 deletions
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69
src/canvas.cpp
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@@ -69,6 +69,19 @@ void canvas_init(Canvas* self, const vec2& size)
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(f32), (void*)0);
// Grid
glGenVertexArrays(1, &self->gridVAO);
glBindVertexArray(self->gridVAO);
glGenBuffers(1, &self->gridVBO);
glBindBuffer(GL_ARRAY_BUFFER, self->gridVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(CANVAS_GRID_VERTICES), CANVAS_GRID_VERTICES, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 2, (void*)0);
glBindVertexArray(0);
// Texture
glGenVertexArrays(1, &self->textureVAO);
glGenBuffers(1, &self->textureVBO);
@@ -93,7 +106,7 @@ void canvas_init(Canvas* self, const vec2& size)
_canvas_texture_init(self, size);
}
mat4 canvas_transform_get(Canvas* self, vec2& pan, f32& zoom, OriginType origin)
mat4 canvas_transform_get(Canvas* self, vec2 pan, f32 zoom, OriginType origin)
{
f32 zoomFactor = PERCENT_TO_UNIT(zoom);
mat4 projection = glm::ortho(0.0f, self->size.x, 0.0f, self->size.y, -1.0f, 1.0f);
@@ -136,55 +149,21 @@ void canvas_texture_set(Canvas* self)
}
}
void canvas_grid_draw(Canvas* self, GLuint& shader, mat4& transform, f32& zoom, ivec2& size, ivec2& offset, vec4& color)
void canvas_grid_draw(Canvas* self, GLuint& shader, mat4& transform, ivec2& size, ivec2& offset, vec4& color)
{
if (size.x <= 0 || size.y <= 0)
return; // avoid div-by-zero
std::vector<f32> vertices;
vec2 gridSize = self->size * (PERCENT_TO_UNIT(CANVAS_ZOOM_MAX - zoom));
// First visible vertical line <= 0
s32 startX = -(offset.x % size.x);
if (startX > 0) startX -= size.x;
for (s32 x = startX; x <= gridSize.x; x += size.x)
{
vertices.push_back((f32)x);
vertices.push_back(0.0f);
vertices.push_back((f32)x);
vertices.push_back((f32)gridSize.y);
}
// First visible horizontal line <= 0
s32 startY = -(offset.y % size.y);
if (startY > 0) startY -= size.y;
for (s32 y = startY; y <= gridSize.y; y += size.y)
{
vertices.push_back(0.0f);
vertices.push_back((f32)y);
vertices.push_back((f32)gridSize.x);
vertices.push_back((f32)y);
}
s32 vertexCount = (s32)vertices.size() / 2;
if (vertexCount == 0)
return;
glBindVertexArray(self->gridVAO);
glBindBuffer(GL_ARRAY_BUFFER, self->gridVBO);
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(f32), vertices.data(), GL_DYNAMIC_DRAW);
mat4 inverseTransform = glm::inverse(transform);
glUseProgram(shader);
glBindVertexArray(self->gridVAO);
glUniformMatrix4fv(glGetUniformLocation(shader, SHADER_UNIFORM_TRANSFORM), 1, GL_FALSE, value_ptr(transform));
glUniform4f(glGetUniformLocation(shader, SHADER_UNIFORM_COLOR), color.r, color.g, color.b, color.a);
glDrawArrays(GL_LINES, 0, vertexCount);
glUniformMatrix4fv(glGetUniformLocation(shader, SHADER_UNIFORM_MODEL), 1, GL_FALSE, glm::value_ptr(inverseTransform));
glUniform2f(glGetUniformLocation(shader, SHADER_UNIFORM_SIZE), size.x, size.y);
glUniform2f(glGetUniformLocation(shader, SHADER_UNIFORM_OFFSET), offset.x, offset.y);
glUniform4f(glGetUniformLocation(shader, SHADER_UNIFORM_COLOR), color.r, color.g, color.b, color.a);
glBindVertexArray(self->gridVAO);
glDrawArrays(GL_TRIANGLES, 0, 3);
glBindVertexArray(0);
glUseProgram(0);
}