shaders: rename public APIs for matrix management

To make clear that these functions are to be called only when
implementing shaders in the client code, rename them to have a
"ogx_shader" prefix. Also use the "_gx" or "_gl" suffix to indicate
whether they expect the matrix to be in the GX or OpenGL format.

examples/sdl2/opengl20/opengx_shaders.c

@@ -36,7 +36,7 @@ static void gl2gears_setup_draw(GLuint program, const OgxDrawData *draw_data,
     glGetUniformfv(program, data->mat_color_loc, colorf);
     float light_dir[4];
     glGetUniformfv(program, data->light_pos_loc, light_dir);
-    ogx_set_mvp_matrix(m);
+    ogx_shader_set_mvp_gl(m);
 
     Mtx normalm;
     ogx_matrix_gl_to_mtx(normal_matrix, normalm);
@@ -80,7 +80,7 @@ static void cube_tex_setup_draw(GLuint program, const OgxDrawData *draw_data,
     glGetUniformfv(program, data->mvp_loc, m);
     GLint texture_unit;
     glGetUniformiv(program, data->tex_sampler_loc, &texture_unit);
-    ogx_set_mvp_matrix(m);
+    ogx_shader_set_mvp_gl(m);
 
     uint8_t tex_map = GX_TEXMAP0;
     uint8_t tex_coord = GX_TEXCOORD0;

src/gc_gl.c

@@ -124,7 +124,7 @@ static void get_projection_info(const Mtx44 matrix, u8 *type, float *near, float
     }
 }
 
-void ogx_set_projection_gx(const Mtx44 matrix)
+void _ogx_set_projection(const Mtx44 matrix)
 {
     /* OpenGL's projection matrix transform the scene into a clip space where
      * all the coordinates lie in the range [-1, 1]. Nintendo's GX, however,
@@ -154,7 +154,7 @@ void ogx_set_projection_gx(const Mtx44 matrix)
 
 static inline void update_projection_matrix()
 {
-    ogx_set_projection_gx(glparamstate.projection_matrix);
+    _ogx_set_projection(glparamstate.projection_matrix);
 }
 
 static inline void update_normal_matrix()

src/opengx.h

@@ -176,19 +176,15 @@ void ogx_shader_setup_attribute_array(int index, uint8_t gx_attr,
                                       const OgxDrawData *draw_data);
 void *ogx_shader_get_data(GLuint shader);
 
-void ogx_set_projection_gx(const Mtx44 matrix);
-static inline void ogx_set_projection_gl(const GLfloat *matrix)
+void ogx_shader_set_projection_gx(const Mtx44 matrix);
+static inline void ogx_shader_set_projection_gl(const GLfloat *matrix)
 {
     Mtx44 m;
     for (int i = 0; i < 16; i++) {
         m[i % 4][i / 4] = matrix[i];
     }
-    ogx_set_projection_gx(m);
+    ogx_shader_set_projection_gx(m);
 }
-/* Many OpenGL 2.0+ apps pass a uniform with the model-view-projection matrix
- * to the vertex shader. This function decomposes it into MV and projection
- * matrices, and uploads them separately to GX. */
-void ogx_set_mvp_matrix(const GLfloat *matrix);
 
 static inline void ogx_matrix_gl_to_mtx(const GLfloat *matrix, Mtx m)
 {
@@ -199,6 +195,19 @@ static inline void ogx_matrix_gl_to_mtx(const GLfloat *matrix, Mtx m)
     }
 }
 
+void ogx_shader_set_modelview_gx(const Mtx matrix);
+static inline void ogx_shader_set_modelview_gl(const GLfloat *matrix)
+{
+    Mtx m;
+    ogx_matrix_gl_to_mtx(matrix, m);
+    ogx_shader_set_modelview_gx(m);
+}
+
+/* Many OpenGL 2.0+ apps pass a uniform with the model-view-projection matrix
+ * to the vertex shader. This function decomposes it into MV and projection
+ * matrices, and uploads them separately to GX. */
+void ogx_shader_set_mvp_gl(const GLfloat *matrix);
+
 #ifdef __cplusplus
 } // extern C
 #endif

src/shader_api.c

@@ -29,6 +29,7 @@ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/
 
+#define BUILDING_SHADER_CODE
 #include "debug.h"
 #include "opengx.h"
 #include "shader.h"
@@ -44,7 +45,18 @@ static void scale_matrix(const GLfloat *matrix, float divisor, float *out)
         out[i] = matrix[i] / divisor;
 }
 
-void ogx_set_mvp_matrix(const GLfloat *matrix)
+void ogx_shader_set_projection_gx(const Mtx44 matrix)
+{
+    _ogx_set_projection(matrix);
+}
+
+void ogx_shader_set_modelview_gx(const Mtx matrix)
+{
+    GX_LoadPosMtxImm((void*)matrix, GX_PNMTX0);
+    GX_SetCurrentMtx(GX_PNMTX0);
+}
+
+void ogx_shader_set_mvp_gl(const GLfloat *matrix)
 {
     Mtx44 proj;
     Mtx mv;
@@ -95,9 +107,8 @@ void ogx_set_mvp_matrix(const GLfloat *matrix)
             mv[row][col] = matrix[col * 4 + row];
         }
     }
-    ogx_set_projection_gx(proj);
-    GX_LoadPosMtxImm(mv, GX_PNMTX0);
-    GX_SetCurrentMtx(GX_PNMTX0);
+    ogx_shader_set_projection_gx(proj);
+    ogx_shader_set_modelview_gx(mv);
 
     /* In the unlikely case that some fixed-pipeline drawing happens, we mark
      * the matrices as dirty so that they'd be reconfigured when needed. */

src/utils.h

@@ -351,6 +351,8 @@ void _ogx_setup_2D_projection(void);
 /* Set the OpenGL 3D modelview and projection matrices */
 void _ogx_setup_3D_projection(void);
 
+void _ogx_set_projection(const Mtx44 matrix);
+
 bool _ogx_setup_render_stages(void);
 void _ogx_update_vertex_array_readers(OgxDrawMode mode);