CMakeLists.txt

@@ -104,7 +104,6 @@ set(TWN_NONOPT_SOURCE_FILES
 
         src/rendering/twn_draw.c src/rendering/twn_draw_c.h
         src/rendering/twn_sprites.c
-        src/rendering/twn_rects.c
         src/rendering/twn_text.c
         src/rendering/twn_triangles.c
         src/rendering/twn_circles.c

include/twn_texture_modes.h

@@ -1,9 +1,6 @@
 #ifndef TWN_TEXTURES_MODES_H
 #define TWN_TEXTURES_MODES_H
 
-/* TODO: rename, as it doesn't have to be about textures only, but blending */
-/* TODO: move from public /include/ tree */
-
 /* alpha channel information */
 typedef enum TextureMode {
     TEXTURE_MODE_OPAQUE,        /* all pixels are solid */

src/rendering/twn_draw.c

@@ -35,6 +35,22 @@ void render_queue_clear(void) {
 }
 
 
+/* rectangle */
+void draw_rectangle(Rect rect, Color color) {
+    RectPrimitive rectangle = {
+        .rect = rect,
+        .color = color,
+    };
+
+    Primitive2D primitive = {
+        .type = PRIMITIVE_2D_RECT,
+        .rect = rectangle,
+    };
+
+    arrput(ctx.render_queue_2d, primitive);
+}
+
+
 void draw_9slice(const char *texture_path, int texture_w, int texture_h, int border_thickness, Rect rect, Color color) {
     const float bt = (float)border_thickness; /* i know! */
     const float bt2 = bt * 2; /* combined size of the two borders in an axis */
@@ -188,25 +204,19 @@ static void render_2d(void) {
 
         switch (current->type) {
             case PRIMITIVE_2D_SPRITE: {
-                const struct QuadBatch batch =
+                const struct SpriteBatch batch =
                     collect_sprite_batch(current, render_queue_len - i);
 
                 /* TODO: what's even the point? just use OR_EQUAL comparison */
                 set_depth_range((double)batch_count / UINT16_MAX, 1.0);
-                render_sprite_batch(current, batch);
+                render_sprites(current, batch);
 
                 i += batch.size - 1; ++batch_count;
                 break;
             }
-            case PRIMITIVE_2D_RECT: {
-                const struct QuadBatch batch =
-                    collect_rect_batch(current, render_queue_len - i);
-
-                render_rect_batch(current, batch);
-
-                i += batch.size - 1; ++batch_count;
+            case PRIMITIVE_2D_RECT:
+                render_rectangle(&current->rect);
                 break;
-            }
             case PRIMITIVE_2D_CIRCLE:
                 render_circle(&current->circle);
                 break;

src/rendering/twn_draw_c.h

@@ -135,18 +135,15 @@ void create_circle_geometry(Vec2 position,
                             SDL_Vertex vertices[],
                             int indices[]);
 
-struct QuadBatch {
+struct SpriteBatch {
     size_t size;             /* how many primitives are in current batch */
-    TextureMode mode;        /* how color should be applied */
+    TextureMode mode;
     bool constant_colored;   /* whether colored batch is uniformly colored */
     bool repeat;             /* whether repeat is needed */
-    bool textured;
-} collect_quad_batch(const Primitive2D primitives[], size_t len);
-void render_quad_batch(const Primitive2D primitives[], struct QuadBatch batch);
-struct QuadBatch collect_sprite_batch(const Primitive2D primitives[], size_t len);
-struct QuadBatch collect_rect_batch(const Primitive2D primitives[], size_t len);
-void render_sprite_batch(const Primitive2D primitives[], struct QuadBatch batch);
-void render_rect_batch(const Primitive2D primitives[], struct QuadBatch batch);
+} collect_sprite_batch(const Primitive2D primitives[], size_t len);
+
+void render_sprites(const Primitive2D primitives[],
+                    const struct SpriteBatch batch);
 
 void draw_uncolored_space_traingle_batch(MeshBatch *batch,
                                          TextureKey texture_key);
@@ -167,14 +164,14 @@ VertexBuffer create_vertex_buffer(void);
 
 void delete_vertex_buffer(VertexBuffer buffer);
 
-void specify_vertex_buffer(VertexBuffer buffer, void const *data, size_t bytes);
+void specify_vertex_buffer(VertexBuffer buffer, void *data, size_t bytes);
 
 /* uses present in 1.5 buffer mapping feature */
 VertexBufferBuilder build_vertex_buffer(VertexBuffer buffer, size_t bytes);
 
 /* collects bytes for sending to the gpu until all is pushed, which is when false is returned */
 bool push_to_vertex_buffer_builder(VertexBufferBuilder *builder,
-                                   void const *bytes,
+                                   void *bytes,
                                    size_t size);
 
 /* state */
@@ -199,17 +196,19 @@ void use_2d_pipeline(void);
 
 void use_texture_mode(TextureMode mode);
 
-void finally_render_quads(Primitive2D const primitives[],
-                          struct QuadBatch batch,
-                          VertexBuffer buffer);
+void upload_quad_vertices(Rect rect);
 
-size_t get_quad_payload_size(struct QuadBatch batch);
+void finally_render_sprites(Primitive2D const primitives[],
+                            struct SpriteBatch batch,
+                            VertexBuffer buffer);
 
-bool push_quad_payload_to_vertex_buffer_builder(struct QuadBatch batch,
-                                                VertexBufferBuilder *builder,
-                                                Vec2 v0, Vec2 v1, Vec2 v2, Vec2 v3,
-                                                Vec2 uv0, Vec2 uv1, Vec2 uv2, Vec2 uv3,
-                                                Color color);
+size_t get_sprite_payload_size(struct SpriteBatch batch);
+
+bool push_sprite_payload_to_vertex_buffer_builder(struct SpriteBatch batch,
+                                                  VertexBufferBuilder *builder,
+                                                  Vec2 v0, Vec2 v1, Vec2 v2, Vec2 v3,
+                                                  Vec2 uv0, Vec2 uv1, Vec2 uv2, Vec2 uv3,
+                                                  Color color);
 
 void finally_draw_uncolored_space_traingle_batch(MeshBatch const *batch,
                                                  TextureKey texture_key,

src/rendering/twn_gl_15_rendering.c

@@ -3,7 +3,6 @@
 #include "twn_util_c.h"
 #include "twn_engine_context_c.h"
 #include "twn_text_c.h"
-#include "twn_types.h"
 
 #include <glad/glad.h>
 #include <stb_ds.h>
@@ -49,34 +48,6 @@ typedef struct ElementIndexedQuadWithoutColor {
 } ElementIndexedQuadWithoutColor;
 
 
-typedef struct ElementIndexedQuadWithoutTexture {
-    /* upper-left */
-    Vec2 v0;
-    Color c0;
-    /* bottom-left */
-    Vec2 v1;
-    Color c1;
-    /* bottom-right */
-    Vec2 v2;
-    Color c2;
-    /* upper-right */
-    Vec2 v3;
-    Color c3;
-} ElementIndexedQuadWithoutTexture;
-
-
-typedef struct ElementIndexedQuadWithoutColorWithoutTexture {
-    /* upper-left */
-    Vec2 v0;
-    /* bottom-left */
-    Vec2 v1;
-    /* bottom-right */
-    Vec2 v2;
-    /* upper-right */
-    Vec2 v3;
-} ElementIndexedQuadWithoutColorWithoutTexture;
-
-
 typedef enum {
     PIPELINE_NO,
     PIPELINE_SPACE,
@@ -168,6 +139,33 @@ void use_2d_pipeline(void) {
 }
 
 
+void upload_quad_vertices(Rect rect) {
+    /* client memory needs to be reachable on glDraw*, so */
+    static float vertices[6 * 2];
+
+    vertices[0]  = rect.x;          vertices[1]  = rect.y;
+    vertices[2]  = rect.x;          vertices[3]  = rect.y + rect.h;
+    vertices[4]  = rect.x + rect.w; vertices[5]  = rect.y + rect.h;
+    vertices[6]  = rect.x + rect.w; vertices[7]  = rect.y + rect.h;
+    vertices[8]  = rect.x + rect.w; vertices[9]  = rect.y;
+    vertices[10] = rect.x;          vertices[11] = rect.y;
+
+    glVertexPointer(2, GL_FLOAT, 0, (void *)&vertices);
+}
+
+
+void render_rectangle(const RectPrimitive *rectangle) {
+    glColor4ub(rectangle->color.r, rectangle->color.g,
+               rectangle->color.b, rectangle->color.a);
+
+    glEnableClientState(GL_VERTEX_ARRAY);
+    upload_quad_vertices(rectangle->rect);
+
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    glDisableClientState(GL_VERTEX_ARRAY);
+}
+
+
 void render_circle(const CirclePrimitive *circle) {
     static SDL_Vertex vertices[CIRCLE_VERTICES_MAX];
     static int indices[CIRCLE_VERTICES_MAX * 3];
@@ -260,7 +258,7 @@ VertexBufferBuilder build_vertex_buffer(VertexBuffer buffer, size_t bytes) {
 
 
 bool push_to_vertex_buffer_builder(VertexBufferBuilder *builder,
-                                   void const *bytes, size_t size) {
+                                   void *bytes, size_t size) {
     if (builder->bytes_left == 0)
         return false;
 
@@ -279,30 +277,24 @@ bool push_to_vertex_buffer_builder(VertexBufferBuilder *builder,
 }
 
 
-void finally_render_quads(const Primitive2D primitives[],
-                          const struct QuadBatch batch,
-                          const VertexBuffer buffer)
+void finally_render_sprites(const Primitive2D primitives[],
+                            const struct SpriteBatch batch,
+                            const VertexBuffer buffer)
 {
     (void)buffer;
 
-    GLsizei off = 0, voff = 0, uvoff = 0, coff = 0;
+    GLsizei off;
+    GLsizei voff;
+    GLsizei uvoff;
 
-    if (!batch.constant_colored && batch.textured) {
+    if (!batch.constant_colored) {
         off   = offsetof(ElementIndexedQuad, v1);
         voff  = offsetof(ElementIndexedQuad, v0);
         uvoff = offsetof(ElementIndexedQuad, uv0);
-        coff  = offsetof(ElementIndexedQuad, c0);
-    } else if (batch.constant_colored && batch.textured) {
+    } else {
         off   = offsetof(ElementIndexedQuadWithoutColor, v1);
         voff  = offsetof(ElementIndexedQuadWithoutColor, v0);
         uvoff = offsetof(ElementIndexedQuadWithoutColor, uv0);
-    } else if (!batch.constant_colored && !batch.textured) {
-        off   = offsetof(ElementIndexedQuadWithoutTexture, v1);
-        voff  = offsetof(ElementIndexedQuadWithoutTexture, v0);
-        coff  = offsetof(ElementIndexedQuad, c0);
-    } else if (batch.constant_colored && !batch.textured) {
-        off   = offsetof(ElementIndexedQuadWithoutColorWithoutTexture, v1);
-        voff  = offsetof(ElementIndexedQuadWithoutColorWithoutTexture, v0);
     }
 
     /* vertex specification */
@@ -312,82 +304,65 @@ void finally_render_quads(const Primitive2D primitives[],
                     off,
                     (void *)(size_t)voff);
 
-    if (batch.textured) {
-        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
-        glClientActiveTexture(GL_TEXTURE0);
-        glTexCoordPointer(2,
-                          GL_FLOAT,
-                          off,
-                          (void *)(size_t)uvoff);
-    }
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glClientActiveTexture(GL_TEXTURE0);
+    glTexCoordPointer(2,
+                      GL_FLOAT,
+                      off,
+                      (void *)(size_t)uvoff);
 
     if (!batch.constant_colored) {
         glEnableClientState(GL_COLOR_ARRAY);
         glColorPointer(4,
                        GL_UNSIGNED_BYTE,
                        off,
-                       (void *)(size_t)coff);
+                       (void *)offsetof(ElementIndexedQuad, c0));
     } else
         glColor4ub(primitives[0].sprite.color.r,
                    primitives[0].sprite.color.g,
                    primitives[0].sprite.color.b,
                    primitives[0].sprite.color.a);
 
-    if (batch.textured) {
-        if (!batch.repeat)
-            textures_bind(&ctx.texture_cache, primitives->sprite.texture_key);
-        else
-            textures_bind_repeating(&ctx.texture_cache, primitives->sprite.texture_key);
-    }
+    if (!batch.repeat)
+        textures_bind(&ctx.texture_cache, primitives->sprite.texture_key);
+    else
+        textures_bind_repeating(&ctx.texture_cache, primitives->sprite.texture_key);
 
     bind_quad_element_buffer();
 
     glDrawElements(GL_TRIANGLES, 6 * (GLsizei)batch.size, GL_UNSIGNED_SHORT, NULL);
 
     /* clear the state */
-    {
-        glBufferData(GL_ARRAY_BUFFER, 0, NULL, GL_STREAM_DRAW);
-        glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBufferData(GL_ARRAY_BUFFER, 0, NULL, GL_STREAM_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
 
-        if (batch.textured)
-            glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glDisableClientState(GL_VERTEX_ARRAY);
 
-        glDisableClientState(GL_VERTEX_ARRAY);
+    if (!batch.constant_colored)
+        glDisableClientState(GL_COLOR_ARRAY);
 
-        if (!batch.constant_colored)
-            glDisableClientState(GL_COLOR_ARRAY);
-
-        if (batch.textured)
-            glBindTexture(GL_TEXTURE_2D, 0);
-
-        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
-    }
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 }
 
 
-size_t get_quad_payload_size(struct QuadBatch batch) {
-    if (batch.constant_colored && batch.textured)
+size_t get_sprite_payload_size(struct SpriteBatch batch) {
+    if (batch.constant_colored)
         return sizeof (ElementIndexedQuadWithoutColor);
-    else if (!batch.constant_colored && batch.textured)
+    else
         return sizeof (ElementIndexedQuad);
-    else if (batch.constant_colored && !batch.textured)
-        return sizeof (ElementIndexedQuadWithoutTexture);
-    else if (!batch.constant_colored && !batch.textured)
-        return sizeof (ElementIndexedQuadWithoutColorWithoutTexture);
-
-    SDL_assert(false);
-    return 0;
 }
 
 
-bool push_quad_payload_to_vertex_buffer_builder(struct QuadBatch batch,
-                                                VertexBufferBuilder *builder,
-                                                Vec2 v0, Vec2 v1, Vec2 v2, Vec2 v3,
-                                                Vec2 uv0, Vec2 uv1, Vec2 uv2, Vec2 uv3,
-                                                Color color)
+bool push_sprite_payload_to_vertex_buffer_builder(struct SpriteBatch batch,
+                                                  VertexBufferBuilder *builder,
+                                                  Vec2 v0, Vec2 v1, Vec2 v2, Vec2 v3,
+                                                  Vec2 uv0, Vec2 uv1, Vec2 uv2, Vec2 uv3,
+                                                  Color color)
 {
-    if (!batch.constant_colored && batch.textured) {
-        ElementIndexedQuad const buffer_element = {
+    if (!batch.constant_colored) {
+        ElementIndexedQuad buffer_element = {
             .v0 = v0,
             .v1 = v1,
             .v2 = v2,
@@ -407,8 +382,8 @@ bool push_quad_payload_to_vertex_buffer_builder(struct QuadBatch batch,
 
         return push_to_vertex_buffer_builder(builder, &buffer_element, sizeof buffer_element);
 
-    } else if (batch.constant_colored && batch.textured) {
-        ElementIndexedQuadWithoutColor const buffer_element = {
+    } else {
+        ElementIndexedQuadWithoutColor buffer_element = {
             .v0 = v0,
             .v1 = v1,
             .v2 = v2,
@@ -420,37 +395,8 @@ bool push_quad_payload_to_vertex_buffer_builder(struct QuadBatch batch,
             .uv3 = uv3,
         };
 
-        return push_to_vertex_buffer_builder(builder, &buffer_element, sizeof buffer_element);
-
-    } else if (!batch.constant_colored && !batch.textured) {
-        ElementIndexedQuadWithoutTexture const buffer_element = {
-            .v0 = v0,
-            .v1 = v1,
-            .v2 = v2,
-            .v3 = v3,
-
-            /* equal for all (flat shaded) */
-            .c0 = color,
-            .c1 = color,
-            .c2 = color,
-            .c3 = color,
-        };
-
-        return push_to_vertex_buffer_builder(builder, &buffer_element, sizeof buffer_element);
-
-    } else if (batch.constant_colored && !batch.textured) {
-        ElementIndexedQuadWithoutColorWithoutTexture const buffer_element = {
-            .v0 = v0,
-            .v1 = v1,
-            .v2 = v2,
-            .v3 = v3,
-        };
-
         return push_to_vertex_buffer_builder(builder, &buffer_element, sizeof buffer_element);
     }
-
-    SDL_assert(false);
-    return false;
 }
 
 

src/rendering/twn_gl_any_rendering.c

@@ -26,7 +26,7 @@ void delete_vertex_buffer(VertexBuffer buffer) {
 }
 
 
-void specify_vertex_buffer(VertexBuffer buffer, void const *data, size_t bytes) {
+void specify_vertex_buffer(VertexBuffer buffer, void *data, size_t bytes) {
     glBindBuffer(GL_ARRAY_BUFFER, buffer);
     glBufferData(GL_ARRAY_BUFFER, bytes, data, GL_STREAM_DRAW);
 }
@@ -74,9 +74,6 @@ void clear_draw_buffer(void) {
     /* TODO: don't clear color when skybox is applied? */
     /*       for that window should match framebuffer */
     /*       also it is driver dependent, from what i can gather */
-    /* INFO: also, based on below, driver might prefer it staying this way */
-    /*       https://gamedev.stackexchange.com/questions/90344/render-with-const-depth-value */
-    /*       we could optionally load ARB_invalidate_subdata extension if it's available instead */
     glClear(GL_COLOR_BUFFER_BIT |
             GL_DEPTH_BUFFER_BIT |
             GL_STENCIL_BUFFER_BIT);

src/rendering/twn_quads.c

@@ -1,30 +0,0 @@
-#include "twn_draw_c.h"
-
-#include <stddef.h>
-
-
-struct QuadBatch collect_quad_batch(const Primitive2D primitives[], size_t len) {
-    if (primitives[0].type == PRIMITIVE_2D_SPRITE)
-        return collect_sprite_batch(primitives, len);
-    else if (primitives[0].type == PRIMITIVE_2D_RECT)
-        return collect_rect_batch(primitives, len);
-    else
-        SDL_assert(false);
-
-    return (struct QuadBatch){0};
-}
-
-
-/* assumes that orthogonal matrix setup is done already */
-void render_quad_batch(const Primitive2D primitives[],
-                       const struct QuadBatch batch)
-{
-    if (primitives[0].type == PRIMITIVE_2D_SPRITE)
-        render_sprite_batch(primitives, batch);
-    else if (primitives[0].type == PRIMITIVE_2D_RECT)
-        render_rect_batch(primitives, batch);
-    else
-        SDL_assert(false);
-
-    return (struct QuadBatch){0};
-}

src/rendering/twn_rects.c

@@ -1,104 +0,0 @@
-#include "twn_draw.h"
-#include "twn_draw_c.h"
-#include "twn_engine_context_c.h"
-#include "twn_util.h"
-#include "twn_util_c.h"
-#include "twn_textures_c.h"
-#include "twn_option.h"
-
-#include <stb_ds.h>
-
-#include <stdbool.h>
-#include <stddef.h>
-
-
-void draw_rectangle(Rect rect, Color color) {
-    RectPrimitive rectangle = {
-        .rect = rect,
-        .color = color,
-    };
-
-    Primitive2D primitive = {
-        .type = PRIMITIVE_2D_RECT,
-        .rect = rectangle,
-    };
-
-    arrput(ctx.render_queue_2d, primitive);
-}
-
-
-struct QuadBatch collect_rect_batch(const Primitive2D primitives[], size_t len) {
-    SDL_assert(primitives[0].type == PRIMITIVE_2D_RECT);
-    SDL_assert(primitives && len != 0);
-
-    struct QuadBatch batch = {
-        .mode = primitives[0].rect.color.a == 255 ? TEXTURE_MODE_OPAQUE : TEXTURE_MODE_GHOSTLY,
-        .constant_colored = true,
-    };
-
-    const uint32_t uniform_color = *(const uint32_t *)&primitives[0].rect.color;
-
-    /* batch size is clamped so that reallocated short indices could be used */
-    if (len >= QUAD_ELEMENT_BUFFER_LENGTH)
-        len = QUAD_ELEMENT_BUFFER_LENGTH;
-
-    for (size_t i = 0; i < len; ++i) {
-        const Primitive2D *const current = &primitives[i];
-
-        /* don't touch things other than rectangles */
-        if (current->type != PRIMITIVE_2D_RECT)
-            break;
-
-        /* only collect the same blend modes */
-        if ((current->rect.color.a == 255 ? TEXTURE_MODE_OPAQUE : TEXTURE_MODE_GHOSTLY) != batch.mode)
-            break;
-
-        /* if all are modulated the same we can skip sending the color data */
-        if (*(const uint32_t *)&current->rect.color != uniform_color)
-            batch.constant_colored = false;
-
-        ++batch.size;
-    }
-
-    return batch;
-}
-
-
-/* assumes that orthogonal matrix setup is done already */
-void render_rect_batch(const Primitive2D primitives[],
-                       const struct QuadBatch batch)
-{
-    SDL_assert(primitives && batch.size != 0);
-    SDL_assert(primitives[0].type == PRIMITIVE_2D_RECT);
-
-    /* single vertex array is used for every batch with NULL glBufferData() trick at the end */
-    static VertexBuffer vertex_array = 0;
-    if (vertex_array == 0)
-        vertex_array = create_vertex_buffer();
-
-    use_texture_mode(batch.mode);
-
-    /* vertex population over a vertex buffer builder interface */
-    {
-        VertexBufferBuilder payload = build_vertex_buffer(vertex_array, get_quad_payload_size(batch) * batch.size);
-
-        for (size_t i = 0; i < batch.size; ++i) {
-            /* render opaques front to back, to gain benefit of an early z rejection */
-            const size_t cur = batch.mode == TEXTURE_MODE_GHOSTLY ? i : batch.size - i - 1;
-            const RectPrimitive rect = primitives[cur].rect;
-
-            Vec2 v0 = { rect.rect.x,          rect.rect.y };
-            Vec2 v1 = { rect.rect.x,          rect.rect.y + rect.rect.h };
-            Vec2 v2 = { rect.rect.x + rect.rect.w, rect.rect.y + rect.rect.h };
-            Vec2 v3 = { rect.rect.x + rect.rect.w, rect.rect.y };
-
-            push_quad_payload_to_vertex_buffer_builder(
-                batch, &payload,
-                v0, v1, v2, v3,
-                (Vec2){0}, (Vec2){0}, (Vec2){0}, (Vec2){0},
-                rect.color);
-        }
-    }
-
-    finally_render_quads(primitives, batch, vertex_array);
-}

src/rendering/twn_sprites.c

@@ -60,18 +60,15 @@ void draw_sprite_args(const DrawSpriteArgs args) {
 }
 
 
-struct QuadBatch collect_sprite_batch(const Primitive2D primitives[], size_t len) {
-    SDL_assert(primitives[0].type == PRIMITIVE_2D_SPRITE);
-    SDL_assert(primitives && len != 0);
-
+struct SpriteBatch collect_sprite_batch(const Primitive2D primitives[], size_t len) {
+    /* assumes that first primitive is already a sprite */
     const uint16_t texture_key_id = primitives[0].sprite.texture_key.id;
     const int atlas_id = textures_get_atlas_id(&ctx.texture_cache, primitives[0].sprite.texture_key);
 
-    struct QuadBatch batch = {
+    struct SpriteBatch batch = {
         .mode = textures_get_mode(&ctx.texture_cache, primitives[0].sprite.texture_key),
         .constant_colored = true,
         .repeat = primitives[0].sprite.repeat,
-        .textured = true,
     };
 
     const uint32_t uniform_color = *(const uint32_t *)&primitives[0].sprite.color;
@@ -119,12 +116,9 @@ struct QuadBatch collect_sprite_batch(const Primitive2D primitives[], size_t len
 
 
 /* assumes that orthogonal matrix setup is done already */
-void render_sprite_batch(const Primitive2D primitives[],
-                         const struct QuadBatch batch)
+void render_sprites(const Primitive2D primitives[],
+                    const struct SpriteBatch batch)
 {
-    SDL_assert(primitives && batch.size != 0);
-    SDL_assert(primitives[0].type == PRIMITIVE_2D_SPRITE);
-
     /* single vertex array is used for every batch with NULL glBufferData() trick at the end */
     static VertexBuffer vertex_array = 0;
     if (vertex_array == 0)
@@ -137,10 +131,10 @@ void render_sprite_batch(const Primitive2D primitives[],
 
     /* vertex population over a vertex buffer builder interface */
     {
-        VertexBufferBuilder payload = build_vertex_buffer(vertex_array, get_quad_payload_size(batch) * batch.size);
+        VertexBufferBuilder payload = build_vertex_buffer(vertex_array, get_sprite_payload_size(batch) * batch.size);
 
         for (size_t i = 0; i < batch.size; ++i) {
-            /* render opaques front to back, to gain benefit of an early z rejection */
+            /* render opaques front to back */
             const size_t cur = batch.mode == TEXTURE_MODE_GHOSTLY ? i : batch.size - i - 1;
             const SpritePrimitive sprite = primitives[cur].sprite;
 
@@ -239,9 +233,9 @@ void render_sprite_batch(const Primitive2D primitives[],
                 v3 = (Vec2){ c.x + t.x * +h.x - t.y * -h.y, c.y + t.y * +h.x + t.x * -h.y };
             }
 
-            push_quad_payload_to_vertex_buffer_builder(batch, &payload, v0, v1, v2, v3, uv0, uv1, uv2, uv3, sprite.color);
+            push_sprite_payload_to_vertex_buffer_builder(batch, &payload, v0, v1, v2, v3, uv0, uv1, uv2, uv3, sprite.color);
         }
     }
 
-    finally_render_quads(primitives, batch, vertex_array);
+    finally_render_sprites(primitives, batch, vertex_array);
 }

src/twn_amalgam.c

@@ -15,6 +15,5 @@
 #include "rendering/twn_fog.c"
 #include "rendering/twn_skybox.c"
 #include "rendering/twn_sprites.c"
-#include "rendering/twn_rects.c"
 #include "rendering/twn_text.c"
 #include "rendering/twn_triangles.c"