engine::graphics::PrimitiveRenderer class
#include <src/engine/graphics/primitive_renderer.h>

Handles basic drawing of 'primitives' or geometric 2D objects.

Public static functions

static void Init()
Initializes the renderer to be ready for use.
static void Shutdown()
Shuts down the renderer and frees any allocated resources.
static void StartBatch(const glm::mat4& view_projection)
Starts a batch for submitting primitives to be drawn (called at the beginning of a frame).
static void FinalizeBatch()
'Finishes' the batch of primitives to be drawn preparing the data for rendering.
static void RenderBatch()
Makes the actual GL calls to render the submitted primitives to the screen.
static auto GetTextureSlot(unsigned int texture_id) -> int
Gets the texture slot for a given texture ID.
static void SubmitQuad(const glm::vec2& position, const glm::vec2& size, const glm::vec4& color, float rotation = 0.0f, const glm::vec2& origin = {0.0f, 0.0f})
Submits a colored rectangle (quad) to be drawn at the specified position and size.
static void SubmitTexturedQuad(const glm::vec2& position, const glm::vec2& size, unsigned int texture_id, const glm::vec4& color, float rotation = 0.0f, const glm::vec2& origin = {0.0f, 0.0f}, bool flip_uv = false)
Submits a textured rectangle (quad) to be drawn at the specified position and size.

Function documentation

static void engine::graphics::PrimitiveRenderer::StartBatch(const glm::mat4& view_projection)

Starts a batch for submitting primitives to be drawn (called at the beginning of a frame).

Parameters
view_projection The view-projection matrix for the batch.

static int engine::graphics::PrimitiveRenderer::GetTextureSlot(unsigned int texture_id)

Gets the texture slot for a given texture ID.

Parameters
texture_id The OpenGL texture ID.
Returns The slot index.

static void engine::graphics::PrimitiveRenderer::SubmitQuad(const glm::vec2& position, const glm::vec2& size, const glm::vec4& color, float rotation = 0.0f, const glm::vec2& origin = {0.0f, 0.0f})

Submits a colored rectangle (quad) to be drawn at the specified position and size.

Parameters
position The position of the rectangle's top-left corner.
size The size of the rectangle.
color The RGBA color of the rectangle.
rotation The amount to rotate the quad in degrees.
origin The origin point for rotation (relative to size, 0-1).

static void engine::graphics::PrimitiveRenderer::SubmitTexturedQuad(const glm::vec2& position, const glm::vec2& size, unsigned int texture_id, const glm::vec4& color, float rotation = 0.0f, const glm::vec2& origin = {0.0f, 0.0f}, bool flip_uv = false)

Submits a textured rectangle (quad) to be drawn at the specified position and size.

Parameters
position The position of the rectangle's top-left corner.
size The size of the rectangle.
texture_id The OpenGL texture ID to use.
color The RGBA color (tint) of the rectangle.
rotation The amount to rotate the quad in degrees.
origin The origin point for rotation (relative to size, 0-1).
flip_uv Whether to flip the way the textured quad is rendered.