raster: implement glPixelZoom (#75)

src/functions.c

@@ -241,7 +241,7 @@ static const ProcMap s_proc_map[] = {
  PROC(glPixelStorei),
  //PROC(glPixelTransferf),
  //PROC(glPixelTransferi),
- //PROC(glPixelZoom),
+ PROC(glPixelZoom),
  PROC(glPointSize),
  PROC(glPolygonMode),
  PROC(glPolygonOffset),

src/gc_gl.c

@@ -283,6 +283,8 @@ void ogx_initialize()
  glparamstate.raster_pos[2] = 0.0f;
  glparamstate.raster_pos[3] = 1.0f;
  glparamstate.raster_pos_valid = true;
+ glparamstate.pixel_zoom_x = 1.0f;
+ glparamstate.pixel_zoom_y = 1.0f;
 
  glparamstate.depth_near = 0.0f;
  glparamstate.depth_far = 1.0f;

src/getters.c

@@ -296,6 +296,12 @@ void glGetIntegerv(GLenum pname, GLint *params)
  case GL_RENDER_MODE:
  *params = glparamstate.render_mode;
  return;
+ case GL_ZOOM_X:
+ *params = glparamstate.pixel_zoom_x;
+ break;
+ case GL_ZOOM_Y:
+ *params = glparamstate.pixel_zoom_y;
+ break;
  default:
  return;
  };

src/raster.cpp

@@ -39,6 +39,12 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <malloc.h>
 #include <type_traits>
 
+void glPixelZoom(GLfloat xfactor, GLfloat yfactor)
+{
+ glparamstate.pixel_zoom_x = xfactor;
+ glparamstate.pixel_zoom_y = yfactor;
+}
+
 static void set_current_raster_pos(const guVector *pos)
 {
  guVector pos_mv;
@@ -226,22 +232,22 @@ static void draw_raster_texture(GXTexObj *texture, int width, int height,
 
  int y0, y1;
  if (height < 0) {
- y0 = screen_y + height;
+ y0 = screen_y + height * glparamstate.pixel_zoom_y;
  y1 = screen_y;
  } else {
  /* The first row we read from the bitmap is the bottom row, so let's take
  * this into account and flip the image vertically */
  y0 = screen_y;
- y1 = screen_y - height;
+ y1 = screen_y - height * glparamstate.pixel_zoom_y;
  }
  GX_Begin(GX_QUADS, GX_VTXFMT0, 4);
  GX_Position3f32(screen_x, y0, screen_z);
  GX_TexCoord2u8(0, 0);
  GX_Position3f32(screen_x, y1, screen_z);
  GX_TexCoord2u8(0, 1);
- GX_Position3f32(screen_x + width, y1, screen_z);
+ GX_Position3f32(screen_x + width * glparamstate.pixel_zoom_x, y1, screen_z);
  GX_TexCoord2u8(1, 1);
- GX_Position3f32(screen_x + width, y0, screen_z);
+ GX_Position3f32(screen_x + width * glparamstate.pixel_zoom_x, y0, screen_z);
  GX_TexCoord2u8(1, 0);
  GX_End();
 }

src/state.h

@@ -99,6 +99,8 @@ typedef struct glparams_
  float texture_object_plane_s[4];
  float texture_object_plane_t[4];
  float raster_pos[4];
+ float pixel_zoom_x;
+ float pixel_zoom_y;
  float depth_near;
  float depth_far;
  int cur_modv_mat, cur_proj_mat;