The Update(TM), Part 2

src/canvas.h

@@ -1,33 +1,75 @@
 #pragma once
 
-#include "texture.h"
-#include "shader.h"
+#include "resources.h"
 
-#define CANVAS_ZOOM_MIN 1
-#define CANVAS_ZOOM_MAX 1000
-#define CANVAS_ZOOM_STEP 25
-#define CANVAS_LINE_LENGTH 100000.0f
-#define CANVAS_GRID_RANGE 100
+#define CANVAS_ZOOM_MIN 1.0f
+#define CANVAS_ZOOM_MAX 2000.0f
+#define CANVAS_ZOOM_STEP 10.0f
+#define CANVAS_ZOOM_MOD 10.0f
 #define CANVAS_GRID_MIN 1
-#define CANVAS_GRID_MAX 100
+#define CANVAS_GRID_MAX 1000
+#define CANVAS_LINE_LENGTH (FLT_MAX * 0.001f)
+
+static const vec2 CANVAS_GRID_SIZE = {3200, 1600};
+static const vec2 CANVAS_PIVOT_SIZE = {4, 4};
 
 const f32 CANVAS_AXIS_VERTICES[] = 
 {
-    -CANVAS_LINE_LENGTH,      0.0f,
-    CANVAS_LINE_LENGTH,       0.0f,
-    0.0f,       -CANVAS_LINE_LENGTH,
-    0.0f,        CANVAS_LINE_LENGTH
+    -CANVAS_LINE_LENGTH, 0.0f,
+    CANVAS_LINE_LENGTH, 0.0f,
+    0.0f, -CANVAS_LINE_LENGTH,
+    0.0f, CANVAS_LINE_LENGTH
 };
 
 struct Canvas
 {
-    GLuint fbo;
-    GLuint rbo;
-    GLuint texture;
-    GLuint textureEBO;
-    GLuint textureVAO;
-    GLuint textureVBO;
-    vec2 size;
+    GLuint fbo{};
+    GLuint rbo{};
+    GLuint axisVAO{};
+    GLuint axisVBO{};
+    GLuint rectVAO{};
+    GLuint rectVBO{};
+    GLuint gridVAO{};
+    GLuint gridVBO{};
+    GLuint texture{};
+    GLuint textureEBO{};
+    GLuint textureVAO{};
+    GLuint textureVBO{};
+    vec2 size{};
 };
 
-void canvas_init(Canvas* self, vec2 size);
+void canvas_init(Canvas* self);
+mat4 canvas_transform_get(Canvas* self, vec2& pan, f32& zoom, OriginType origin);
+void canvas_clear(vec4& color);
+void canvas_bind(Canvas* self);
+void canvas_viewport_set(Canvas* self);
+void canvas_unbind(void);
+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_axes_draw(Canvas* self, GLuint& shader, mat4& transform, vec4& color);
+void canvas_rect_draw(Canvas* self, const GLuint& shader, const mat4& transform, const vec4& color);
+void canvas_free(Canvas* self);
+void canvas_draw(Canvas* self);
+
+mat4 canvas_mvp_get
+(
+    mat4& transform, 
+    vec2 size,
+    vec2 position = {0.0f, 0.0f}, 
+    vec2 pivot = {0.0f, 0.0f}, 
+    f32 rotation = {0.0f},
+    vec2 scale = {1.0f, 1.0f},
+    vec2 pivotAlt = {0.0f, 0.0f},
+    f32 rotationAlt = {0.0f}
+);
+
+void canvas_texture_draw
+(
+    Canvas* self, 
+    GLuint& shader, 
+    GLuint& texture, 
+    mat4& transform, 
+    const f32* vertices = GL_UV_VERTICES,
+    vec4 tint = COLOR_OPAQUE,
+    vec3 colorOffset = COLOR_OFFSET_NONE
+);