/* * Clutter COGL * * A basic GL/GLES Abstraction/Utility Layer * * Authored By Matthew Allum * * Copyright (C) 2007 OpenedHand * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "cogl.h" #include #include #include "cogl-internal.h" #include "cogl-util.h" #include "cogl-context.h" #include "cogl-gles2-wrapper.h" /* GL error to string conversion */ #if COGL_DEBUG struct token_string { GLuint Token; const char *String; }; static const struct token_string Errors[] = { { GL_NO_ERROR, "no error" }, { GL_INVALID_ENUM, "invalid enumerant" }, { GL_INVALID_VALUE, "invalid value" }, { GL_INVALID_OPERATION, "invalid operation" }, { GL_STACK_OVERFLOW, "stack overflow" }, { GL_STACK_UNDERFLOW, "stack underflow" }, { GL_OUT_OF_MEMORY, "out of memory" }, #ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT { GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "invalid framebuffer operation" }, #endif { ~0, NULL } }; const char* _cogl_error_string(GLenum errorCode) { int i; for (i = 0; Errors[i].String; i++) { if (Errors[i].Token == errorCode) return Errors[i].String; } return "unknown"; } #endif CoglFuncPtr cogl_get_proc_address (const gchar* name) { return NULL; } gboolean cogl_check_extension (const gchar *name, const gchar *ext) { return FALSE; } void cogl_paint_init (const ClutterColor *color) { #if COGL_DEBUG fprintf(stderr, "\n ============== Paint Start ================ \n"); #endif cogl_wrap_glClearColorx ((color->red << 16) / 0xff, (color->green << 16) / 0xff, (color->blue << 16) / 0xff, 0xff); glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); cogl_wrap_glDisable (GL_LIGHTING); cogl_wrap_glDisable (GL_FOG); } /* FIXME: inline most of these */ void cogl_push_matrix (void) { GE( cogl_wrap_glPushMatrix() ); } void cogl_pop_matrix (void) { GE( cogl_wrap_glPopMatrix() ); } void cogl_scale (ClutterFixed x, ClutterFixed y) { GE( cogl_wrap_glScalex (x, y, CFX_ONE) ); } void cogl_translatex (ClutterFixed x, ClutterFixed y, ClutterFixed z) { GE( cogl_wrap_glTranslatex (x, y, z) ); } void cogl_translate (gint x, gint y, gint z) { GE( cogl_wrap_glTranslatex (CLUTTER_INT_TO_FIXED(x), CLUTTER_INT_TO_FIXED(y), CLUTTER_INT_TO_FIXED(z)) ); } void cogl_rotatex (ClutterFixed angle, ClutterFixed x, ClutterFixed y, ClutterFixed z) { GE( cogl_wrap_glRotatex (angle,x,y,z) ); } void cogl_rotate (gint angle, gint x, gint y, gint z) { GE( cogl_wrap_glRotatex (CLUTTER_INT_TO_FIXED(angle), CLUTTER_INT_TO_FIXED(x), CLUTTER_INT_TO_FIXED(y), CLUTTER_INT_TO_FIXED(z)) ); } static inline gboolean cogl_toggle_flag (CoglContext *ctx, gulong new_flags, gulong flag, GLenum gl_flag) { /* Toggles and caches a single enable flag on or off * by comparing to current state */ if (new_flags & flag) { if (!(ctx->enable_flags & flag)) { GE( cogl_wrap_glEnable (gl_flag) ); ctx->enable_flags |= flag; return TRUE; } } else if (ctx->enable_flags & flag) { GE( cogl_wrap_glDisable (gl_flag) ); ctx->enable_flags &= ~flag; } return FALSE; } static inline gboolean cogl_toggle_client_flag (CoglContext *ctx, gulong new_flags, gulong flag, GLenum gl_flag) { /* Toggles and caches a single client-side enable flag * on or off by comparing to current state */ if (new_flags & flag) { if (!(ctx->enable_flags & flag)) { GE( cogl_wrap_glEnableClientState (gl_flag) ); ctx->enable_flags |= flag; return TRUE; } } else if (ctx->enable_flags & flag) { GE( cogl_wrap_glDisableClientState (gl_flag) ); ctx->enable_flags &= ~flag; } return FALSE; } void cogl_enable (gulong flags) { /* This function essentially caches glEnable state() in the * hope of lessening number GL traffic. */ _COGL_GET_CONTEXT (ctx, NO_RETVAL); cogl_toggle_flag (ctx, flags, COGL_ENABLE_BLEND, GL_BLEND); cogl_toggle_flag (ctx, flags, COGL_ENABLE_TEXTURE_2D, GL_TEXTURE_2D); cogl_toggle_client_flag (ctx, flags, COGL_ENABLE_VERTEX_ARRAY, GL_VERTEX_ARRAY); cogl_toggle_client_flag (ctx, flags, COGL_ENABLE_TEXCOORD_ARRAY, GL_TEXTURE_COORD_ARRAY); cogl_toggle_client_flag (ctx, flags, COGL_ENABLE_COLOR_ARRAY, GL_COLOR_ARRAY); } gulong cogl_get_enable () { _COGL_GET_CONTEXT (ctx, 0); return ctx->enable_flags; } void cogl_blend_func (COGLenum src_factor, COGLenum dst_factor) { /* This function caches the blending setup in the * hope of lessening GL traffic. */ _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (ctx->blend_src_factor != src_factor || ctx->blend_dst_factor != dst_factor) { glBlendFunc (src_factor, dst_factor); ctx->blend_src_factor = src_factor; ctx->blend_dst_factor = dst_factor; } } void cogl_enable_depth_test (gboolean setting) { if (setting) { cogl_wrap_glEnable (GL_DEPTH_TEST); cogl_wrap_glEnable (GL_ALPHA_TEST); glDepthFunc (GL_LEQUAL); cogl_wrap_glAlphaFunc (GL_GREATER, 0.1); } else { cogl_wrap_glDisable (GL_DEPTH_TEST); cogl_wrap_glDisable (GL_ALPHA_TEST); } } void cogl_color (const ClutterColor *color) { _COGL_GET_CONTEXT (ctx, NO_RETVAL); #if 0 /*HAVE_GLES_COLOR4UB*/ /* NOTE: seems SDK_OGLES-1.1_LINUX_PCEMULATION_2.02.22.0756 has this call * but is broken - see #857. Therefor disabling. */ /* * GLES 1.1 does actually have this function, it's in the header file but * missing in the reference manual (and SDK): * * http://www.khronos.org/egl/headers/1_1/gl.h */ GE( glColor4ub (color->red, color->green, color->blue, color->alpha) ); #else /* conversion can cause issues with picking on some gles implementations */ GE( cogl_wrap_glColor4x ((color->red << 16) / 0xff, (color->green << 16) / 0xff, (color->blue << 16) / 0xff, (color->alpha << 16) / 0xff)); #endif /* Store alpha for proper blending enables */ ctx->color_alpha = color->alpha; } static void apply_matrix (const ClutterFixed *matrix, ClutterFixed *vertex) { int x, y; ClutterFixed vertex_out[4] = { 0 }; for (y = 0; y < 4; y++) for (x = 0; x < 4; x++) vertex_out[y] += CFX_QMUL (vertex[x], matrix[y + x * 4]); memcpy (vertex, vertex_out, sizeof (vertex_out)); } static void project_vertex (ClutterFixed *modelview, ClutterFixed *project, ClutterFixed *vertex) { int i; /* Apply the modelview matrix */ apply_matrix (modelview, vertex); /* Apply the projection matrix */ apply_matrix (project, vertex); /* Convert from homogenized coordinates */ for (i = 0; i < 4; i++) vertex[i] = CFX_QDIV (vertex[i], vertex[3]); } static void set_clip_plane (GLint plane_num, const ClutterFixed *vertex_a, const ClutterFixed *vertex_b) { GLfixed plane[4]; GLfixed angle; _COGL_GET_CONTEXT (ctx, NO_RETVAL); /* Calculate the angle between the axes and the line crossing the two points */ angle = CFX_QMUL (clutter_atan2i (vertex_b[1] - vertex_a[1], vertex_b[0] - vertex_a[0]), CFX_RADIANS_TO_DEGREES); GE( cogl_wrap_glPushMatrix () ); /* Load the identity matrix and multiply by the reverse of the projection matrix so we can specify the plane in screen coordinates */ GE( cogl_wrap_glLoadIdentity () ); GE( cogl_wrap_glMultMatrixx ((GLfixed *) ctx->inverse_projection) ); /* Rotate about point a */ GE( cogl_wrap_glTranslatex (vertex_a[0], vertex_a[1], vertex_a[2]) ); /* Rotate the plane by the calculated angle so that it will connect the two points */ GE( cogl_wrap_glRotatex (angle, 0.0f, 0.0f, 1.0f) ); GE( cogl_wrap_glTranslatex (-vertex_a[0], -vertex_a[1], -vertex_a[2]) ); plane[0] = 0; plane[1] = -CFX_ONE; plane[2] = 0; plane[3] = vertex_a[1]; GE( cogl_wrap_glClipPlanex (plane_num, plane) ); GE( cogl_wrap_glPopMatrix () ); GE( cogl_wrap_glEnable (plane_num) ); } void _cogl_set_clip_planes (ClutterFixed x_offset, ClutterFixed y_offset, ClutterFixed width, ClutterFixed height) { GLfixed modelview[16], projection[16]; ClutterFixed vertex_tl[4] = { x_offset, y_offset, 0, CFX_ONE }; ClutterFixed vertex_tr[4] = { x_offset + width, y_offset, 0, CFX_ONE }; ClutterFixed vertex_bl[4] = { x_offset, y_offset + height, 0, CFX_ONE }; ClutterFixed vertex_br[4] = { x_offset + width, y_offset + height, 0, CFX_ONE }; GE( cogl_wrap_glGetFixedv (GL_MODELVIEW_MATRIX, modelview) ); GE( cogl_wrap_glGetFixedv (GL_PROJECTION_MATRIX, projection) ); project_vertex (modelview, projection, vertex_tl); project_vertex (modelview, projection, vertex_tr); project_vertex (modelview, projection, vertex_bl); project_vertex (modelview, projection, vertex_br); /* If the order of the top and bottom lines is different from the order of the left and right lines then the clip rect must have been transformed so that the back is visible. We therefore need to swap one pair of vertices otherwise all of the planes will be the wrong way around */ if ((vertex_tl[0] < vertex_tr[0] ? 1 : 0) != (vertex_bl[1] < vertex_tl[1] ? 1 : 0)) { ClutterFixed temp[4]; memcpy (temp, vertex_tl, sizeof (temp)); memcpy (vertex_tl, vertex_tr, sizeof (temp)); memcpy (vertex_tr, temp, sizeof (temp)); memcpy (temp, vertex_bl, sizeof (temp)); memcpy (vertex_bl, vertex_br, sizeof (temp)); memcpy (vertex_br, temp, sizeof (temp)); } set_clip_plane (GL_CLIP_PLANE0, vertex_tl, vertex_tr); set_clip_plane (GL_CLIP_PLANE1, vertex_tr, vertex_br); set_clip_plane (GL_CLIP_PLANE2, vertex_br, vertex_bl); set_clip_plane (GL_CLIP_PLANE3, vertex_bl, vertex_tl); } static int compare_y_coordinate (const void *a, const void *b) { GLfixed ay = ((const GLfixed *) a)[1]; GLfixed by = ((const GLfixed *) b)[1]; return ay < by ? -1 : ay > by ? 1 : 0; } void _cogl_add_stencil_clip (ClutterFixed x_offset, ClutterFixed y_offset, ClutterFixed width, ClutterFixed height, gboolean first) { gboolean has_clip_planes = cogl_features_available (COGL_FEATURE_FOUR_CLIP_PLANES); _COGL_GET_CONTEXT (ctx, NO_RETVAL); if (has_clip_planes) { GE( cogl_wrap_glDisable (GL_CLIP_PLANE3) ); GE( cogl_wrap_glDisable (GL_CLIP_PLANE2) ); GE( cogl_wrap_glDisable (GL_CLIP_PLANE1) ); GE( cogl_wrap_glDisable (GL_CLIP_PLANE0) ); } if (first) { GE( cogl_wrap_glEnable (GL_STENCIL_TEST) ); /* Initially disallow everything */ GE( glClearStencil (0) ); GE( glClear (GL_STENCIL_BUFFER_BIT) ); /* Punch out a hole to allow the rectangle */ GE( glStencilFunc (GL_NEVER, 0x1, 0x1) ); GE( glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE) ); cogl_rectanglex (x_offset, y_offset, width, height); } else if (ctx->num_stencil_bits > 1) { /* Add one to every pixel of the stencil buffer in the rectangle */ GE( glStencilFunc (GL_NEVER, 0x1, 0x3) ); GE( glStencilOp (GL_INCR, GL_INCR, GL_INCR) ); cogl_rectanglex (x_offset, y_offset, width, height); /* Subtract one from all pixels in the stencil buffer so that only pixels where both the original stencil buffer and the rectangle are set will be valid */ GE( glStencilOp (GL_DECR, GL_DECR, GL_DECR) ); GE( cogl_wrap_glPushMatrix () ); GE( cogl_wrap_glLoadIdentity () ); GE( cogl_wrap_glMatrixMode (GL_PROJECTION) ); GE( cogl_wrap_glPushMatrix () ); GE( cogl_wrap_glLoadIdentity () ); cogl_rectanglex (-CFX_ONE, -CFX_ONE, CLUTTER_INT_TO_FIXED (2), CLUTTER_INT_TO_FIXED (2)); GE( cogl_wrap_glPopMatrix () ); GE( cogl_wrap_glMatrixMode (GL_MODELVIEW) ); GE( cogl_wrap_glPopMatrix () ); } else { /* Slower fallback if there is exactly one stencil bit. This tries to draw enough triangles to tessalate around the rectangle so that it can subtract from the stencil buffer for every pixel in the screen except those in the rectangle */ GLfixed modelview[16], projection[16]; GLfixed temp_point[4]; GLfixed left_edge, right_edge, bottom_edge, top_edge; int i; GLfixed points[16] = { x_offset, y_offset, 0, CFX_ONE, x_offset + width, y_offset, 0, CFX_ONE, x_offset, y_offset + height, 0, CFX_ONE, x_offset + width, y_offset + height, 0, CFX_ONE }; GLfixed draw_points[12]; GE( cogl_wrap_glGetFixedv (GL_MODELVIEW_MATRIX, modelview) ); GE( cogl_wrap_glGetFixedv (GL_PROJECTION_MATRIX, projection) ); /* Project all of the vertices into screen coordinates */ for (i = 0; i < 4; i++) project_vertex (modelview, projection, points + i * 4); /* Sort the points by y coordinate */ qsort (points, 4, sizeof (GLfixed) * 4, compare_y_coordinate); /* Put the bottom two pairs and the top two pairs in left-right order */ if (points[0] > points[4]) { memcpy (temp_point, points, sizeof (GLfixed) * 4); memcpy (points, points + 4, sizeof (GLfixed) * 4); memcpy (points + 4, temp_point, sizeof (GLfixed) * 4); } if (points[8] > points[12]) { memcpy (temp_point, points + 8, sizeof (GLfixed) * 4); memcpy (points + 8, points + 12, sizeof (GLfixed) * 4); memcpy (points + 12, temp_point, sizeof (GLfixed) * 4); } /* If the clip rect goes outside of the screen then use the extents of the rect instead */ left_edge = MIN (-CFX_ONE, MIN (points[0], points[8])); right_edge = MAX ( CFX_ONE, MAX (points[4], points[12])); bottom_edge = MIN (-CFX_ONE, MIN (points[1], points[5])); top_edge = MAX ( CFX_ONE, MAX (points[9], points[13])); /* Using the identity matrix for the projection and modelview matrix, draw the triangles around the inner rectangle */ GE( glStencilFunc (GL_NEVER, 0x1, 0x1) ); GE( glStencilOp (GL_ZERO, GL_ZERO, GL_ZERO) ); GE( cogl_wrap_glPushMatrix () ); GE( cogl_wrap_glLoadIdentity () ); GE( cogl_wrap_glMatrixMode (GL_PROJECTION) ); GE( cogl_wrap_glPushMatrix () ); GE( cogl_wrap_glLoadIdentity () ); cogl_enable (COGL_ENABLE_VERTEX_ARRAY | (ctx->color_alpha < 255 ? COGL_ENABLE_BLEND : 0)); GE( cogl_wrap_glVertexPointer (2, GL_FIXED, 0, draw_points) ); /* Clear the left side */ draw_points[0] = left_edge; draw_points[1] = bottom_edge; draw_points[2] = points[0]; draw_points[3] = points[1]; draw_points[4] = left_edge; draw_points[5] = points[1]; draw_points[6] = points[8]; draw_points[7] = points[9]; draw_points[8] = left_edge; draw_points[9] = points[9]; draw_points[10] = left_edge; draw_points[11] = top_edge; GE( cogl_wrap_glDrawArrays (GL_TRIANGLE_STRIP, 0, 6) ); /* Clear the right side */ draw_points[0] = right_edge; draw_points[1] = top_edge; draw_points[2] = points[12]; draw_points[3] = points[13]; draw_points[4] = right_edge; draw_points[5] = points[13]; draw_points[6] = points[4]; draw_points[7] = points[5]; draw_points[8] = right_edge; draw_points[9] = points[5]; draw_points[10] = right_edge; draw_points[11] = bottom_edge; GE( cogl_wrap_glDrawArrays (GL_TRIANGLE_STRIP, 0, 6) ); /* Clear the top side */ draw_points[0] = left_edge; draw_points[1] = top_edge; draw_points[2] = points[8]; draw_points[3] = points[9]; draw_points[4] = points[8]; draw_points[5] = top_edge; draw_points[6] = points[12]; draw_points[7] = points[13]; draw_points[8] = points[12]; draw_points[9] = top_edge; draw_points[10] = right_edge; draw_points[11] = top_edge; GE( cogl_wrap_glDrawArrays (GL_TRIANGLE_STRIP, 0, 6) ); /* Clear the bottom side */ draw_points[0] = left_edge; draw_points[1] = bottom_edge; draw_points[2] = points[0]; draw_points[3] = points[1]; draw_points[4] = points[0]; draw_points[5] = bottom_edge; draw_points[6] = points[4]; draw_points[7] = points[5]; draw_points[8] = points[4]; draw_points[9] = bottom_edge; draw_points[10] = right_edge; draw_points[11] = bottom_edge; GE( cogl_wrap_glDrawArrays (GL_TRIANGLE_STRIP, 0, 6) ); GE( cogl_wrap_glPopMatrix () ); GE( cogl_wrap_glMatrixMode (GL_MODELVIEW) ); GE( cogl_wrap_glPopMatrix () ); } if (has_clip_planes) { GE( cogl_wrap_glEnable (GL_CLIP_PLANE0) ); GE( cogl_wrap_glEnable (GL_CLIP_PLANE1) ); GE( cogl_wrap_glEnable (GL_CLIP_PLANE2) ); GE( cogl_wrap_glEnable (GL_CLIP_PLANE3) ); } /* Restore the stencil mode */ GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) ); GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) ); } void _cogl_set_matrix (const ClutterFixed *matrix) { GE( cogl_wrap_glLoadIdentity () ); GE( cogl_wrap_glMultMatrixx (matrix) ); } void _cogl_disable_stencil_buffer (void) { GE( cogl_wrap_glDisable (GL_STENCIL_TEST) ); } void _cogl_disable_clip_planes (void) { GE( cogl_wrap_glDisable (GL_CLIP_PLANE3) ); GE( cogl_wrap_glDisable (GL_CLIP_PLANE2) ); GE( cogl_wrap_glDisable (GL_CLIP_PLANE1) ); GE( cogl_wrap_glDisable (GL_CLIP_PLANE0) ); } void cogl_alpha_func (COGLenum func, ClutterFixed ref) { GE( cogl_wrap_glAlphaFunc (func, CLUTTER_FIXED_TO_FLOAT(ref)) ); } /* * Fixed point implementation of the perspective function */ void cogl_perspective (ClutterFixed fovy, ClutterFixed aspect, ClutterFixed zNear, ClutterFixed zFar) { ClutterFixed xmax, ymax; ClutterFixed x, y, c, d; ClutterFixed fovy_rad_half = CFX_MUL (fovy, CFX_PI) / 360; GLfixed m[16]; _COGL_GET_CONTEXT (ctx, NO_RETVAL); memset (&m[0], 0, sizeof (m)); /* * Based on the original algorithm in perspective(): * * 1) xmin = -xmax => xmax + xmin == 0 && xmax - xmin == 2 * xmax * same true for y, hence: a == 0 && b == 0; * * 2) When working with small numbers, we can are loosing significant * precision, hence we use clutter_qmulx() here, not the fast macro. */ ymax = clutter_qmulx (zNear, CFX_DIV (clutter_sinx (fovy_rad_half), clutter_cosx (fovy_rad_half))); xmax = clutter_qmulx (ymax, aspect); x = CFX_DIV (zNear, xmax); y = CFX_DIV (zNear, ymax); c = CFX_DIV (-(zFar + zNear), ( zFar - zNear)); d = CFX_DIV (-(clutter_qmulx (2*zFar, zNear)), (zFar - zNear)); #define M(row,col) m[col*4+row] M(0,0) = x; M(1,1) = y; M(2,2) = c; M(2,3) = d; M(3,2) = 1 + ~CFX_ONE; GE( cogl_wrap_glMultMatrixx (m) ); /* Calculate and store the inverse of the matrix */ memset (ctx->inverse_projection, 0, sizeof (ClutterFixed) * 16); #define m ctx->inverse_projection M(0, 0) = CFX_QDIV (CFX_ONE, x); M(1, 1) = CFX_QDIV (CFX_ONE, y); M(2, 3) = -CFX_ONE; M(3, 2) = CFX_QDIV (CFX_ONE, d); M(3, 3) = CFX_QDIV (c, d); #undef m #undef M } void cogl_setup_viewport (guint w, guint h, ClutterFixed fovy, ClutterFixed aspect, ClutterFixed z_near, ClutterFixed z_far) { gint width = (gint) w; gint height = (gint) h; ClutterFixed z_camera; GE( glViewport (0, 0, width, height) ); GE( cogl_wrap_glMatrixMode (GL_PROJECTION) ); GE( cogl_wrap_glLoadIdentity () ); /* For Ortho projection. * cogl_wrap_glOrthox (0, width << 16, 0, height << 16, -1 << 16, 1 << 16); */ cogl_perspective (fovy, aspect, z_near, z_far); GE( cogl_wrap_glMatrixMode (GL_MODELVIEW) ); GE( cogl_wrap_glLoadIdentity () ); /* * camera distance from screen, 0.5 * tan (FOV) * * See comments in ../gl/cogl.c */ #define DEFAULT_Z_CAMERA 0.869f z_camera = CLUTTER_FLOAT_TO_FIXED (DEFAULT_Z_CAMERA); if (fovy != CFX_60) { ClutterFixed fovy_rad = CFX_MUL (fovy, CFX_PI) / 180; z_camera = CFX_DIV (clutter_sinx (fovy_rad), clutter_cosx (fovy_rad)) >> 1; } GE( cogl_wrap_glTranslatex (-1 << 15, -1 << 15, -z_camera)); GE( cogl_wrap_glScalex ( CFX_ONE / width, -CFX_ONE / height, CFX_ONE / width)); GE( cogl_wrap_glTranslatex (0, -CFX_ONE * height, 0) ); } static void _cogl_features_init () { ClutterFeatureFlags flags = 0; int max_clip_planes = 0; _COGL_GET_CONTEXT (ctx, NO_RETVAL); ctx->num_stencil_bits = 0; GE( cogl_wrap_glGetIntegerv (GL_STENCIL_BITS, &ctx->num_stencil_bits) ); if (ctx->num_stencil_bits > 0) flags |= COGL_FEATURE_STENCIL_BUFFER; GE( cogl_wrap_glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) ); if (max_clip_planes >= 4) flags |= COGL_FEATURE_FOUR_CLIP_PLANES; #ifdef HAVE_COGL_GLES2 flags |= COGL_FEATURE_SHADERS_GLSL; #endif ctx->feature_flags = flags; ctx->features_cached = TRUE; } ClutterFeatureFlags cogl_get_features () { _COGL_GET_CONTEXT (ctx, 0); if (!ctx->features_cached) _cogl_features_init (); return ctx->feature_flags; } gboolean cogl_features_available (CoglFeatureFlags features) { _COGL_GET_CONTEXT (ctx, 0); if (!ctx->features_cached) _cogl_features_init (); return (ctx->feature_flags & features) == features; } void cogl_get_modelview_matrix (ClutterFixed m[16]) { cogl_wrap_glGetFixedv(GL_MODELVIEW_MATRIX, &m[0]); } void cogl_get_projection_matrix (ClutterFixed m[16]) { cogl_wrap_glGetFixedv(GL_PROJECTION_MATRIX, &m[0]); } void cogl_get_viewport (ClutterFixed v[4]) { cogl_wrap_glGetFixedv(GL_VIEWPORT, &v[0]); } void cogl_get_bitmasks (gint *red, gint *green, gint *blue, gint *alpha) { if (red) GE( cogl_wrap_glGetIntegerv(GL_RED_BITS, red) ); if (green) GE( cogl_wrap_glGetIntegerv(GL_GREEN_BITS, green) ); if (blue) GE( cogl_wrap_glGetIntegerv(GL_BLUE_BITS, blue) ); if (alpha) GE( cogl_wrap_glGetIntegerv(GL_ALPHA_BITS, alpha ) ); } void cogl_fog_set (const ClutterColor *fog_color, ClutterFixed density, ClutterFixed z_near, ClutterFixed z_far) { GLfixed fogColor[4]; fogColor[0] = (fog_color->red << 16) / 0xff; fogColor[1] = (fog_color->green << 16) / 0xff; fogColor[2] = (fog_color->blue << 16) / 0xff; fogColor[3] = (fog_color->alpha << 16) / 0xff; cogl_wrap_glEnable (GL_FOG); cogl_wrap_glFogxv (GL_FOG_COLOR, fogColor); cogl_wrap_glFogx (GL_FOG_MODE, GL_LINEAR); glHint (GL_FOG_HINT, GL_NICEST); cogl_wrap_glFogx (GL_FOG_DENSITY, (GLfixed) density); cogl_wrap_glFogx (GL_FOG_START, (GLfixed) z_near); cogl_wrap_glFogx (GL_FOG_END, (GLfixed) z_far); }