Modernize Renderer

BUILD.md

@@ -125,11 +125,11 @@ Once CMake finishes, the built files will be put in `builds/mac/Descent3/Debug`
     * If you would like to manage the code dependencies yourself:
         * APT users
             ```sh
-            sudo apt install -y --no-install-recommends libsdl2-dev zlib1g-dev libgtest-dev
+            sudo apt install -y --no-install-recommends libsdl2-dev zlib1g-dev libgtest-dev libglm-dev
             ```
         * DNF users
             ```sh
-            sudo dnf install -y SDL2-devel zlib-devel gtest
+            sudo dnf install -y SDL2-devel zlib-devel gtest glm-devel
             ```
 
 3. **Clone the Descent3 source code.**

CMakeLists.txt

@@ -5,11 +5,12 @@ if(NOT CMAKE_BUILD_TYPE AND NOT DEFINED ENV{CMAKE_BUILD_TYPE})
   set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "default build type")
 endif()
 
-option(FORCE_COLORED_OUTPUT "Always produce ANSI-colored compiler warnings/errors (GCC/Clang only; esp. useful with Ninja)." OFF)
-option(FORCE_PORTABLE_INSTALL "Install all files into local directory defined by CMAKE_INSTALL_PREFIX" ON)
+option(BUILD_TESTING "Enable testing. Requires GTest." OFF)
 option(ENABLE_LOGGER "Enable logging to the terminal" OFF)
 option(ENABLE_MEM_RTL "Enable Real-time library memory management functions (disable to verbose memory allocations)" ON)
-option(BUILD_TESTING "Enable testing. Requires GTest." OFF)
+option(FATAL_GL_ERRORS "Check OpenGL calls and raise exceptions on errors." OFF)
+option(FORCE_COLORED_OUTPUT "Always produce ANSI-colored compiler warnings/errors (GCC/Clang only; esp. useful with Ninja)." OFF)
+option(FORCE_PORTABLE_INSTALL "Install all files into local directory defined by CMAKE_INSTALL_PREFIX" ON)
 set(USE_VCPKG "DEFAULT" CACHE STRING "Use vcpkg for dependency management. DEFAULT defers to existence of $VCPKG_ROOT environment variable.")
 set_property(CACHE USE_VCPKG PROPERTY STRINGS "DEFAULT" "ON" "OFF")
 
@@ -131,6 +132,7 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
   add_compile_options("-Wno-multichar;-Wall")
 endif()
 
+find_package(glm REQUIRED)
 find_package(SDL2 REQUIRED)
 # Some versions of the SDL2 find_package set SDL2_INCLUDE_DIR and some set a plural SDL2_INCLUDE_DIRS. Check both.
 message("SDL2 Include Dir is ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS}")
@@ -196,6 +198,11 @@ if(ENABLE_LOGGER)
   add_compile_definitions(LOGGER)
 endif()
 
+if(FATAL_GL_ERRORS)
+  message("Raising exceptions on OpenGL errors")
+  add_compile_definitions(FATAL_GL_ERRORS)
+endif()
+
 include_directories(
   "cfile"   # TODO: Remove after untying all modules
   "ddebug"  # -*-

Descent3/TelComAutoMap.cpp

@@ -809,9 +809,6 @@ void TCAMCallback(void) {
   rend_SetOverlayType(OT_NONE);
   rend_SetZBufferState(1);
 
-  if (AM_terrain)
-    rend_SetZValues(0, VisibleTerrainZ);
-
   TCAMBuildRoomList(Viewer_object->roomnum);
   // Render all rooms in view
   for (int i = 0; i < Num_AM_rooms; i++) {

Descent3/render.cpp

@@ -1905,7 +1905,7 @@ void RenderFace(room *rp, int facenum) {
   else
     rend_SetColorModel(CM_RGB);
   // Set lighting map
-  if ((fp->flags & FF_LIGHTMAP) && (!StateLimited || UseMultitexture)) {
+  if ((fp->flags & FF_LIGHTMAP) != 0) {
     if (GameTextures[fp->tmap].flags & TF_SATURATE)
       rend_SetOverlayType(OT_NONE);
     else
@@ -2345,23 +2345,6 @@ void RenderRoomUnsorted(room *rp) {
     for (i = rcount - 1; i >= 0; i--) {
       RenderFace(rp, State_elements[i].facenum);
     }
-
-    if (!UseMultitexture) {
-      // Since we're state limited, we have to render lightmap faces completely separate
-      // Now render lightmap faces
-      rend_SetAlphaType(AT_LIGHTMAP_BLEND);
-      rend_SetLighting(LS_GOURAUD);
-      rend_SetColorModel(CM_MONO);
-      rend_SetOverlayType(OT_NONE);
-      rend_SetTextureType(TT_PERSPECTIVE);
-      rend_SetWrapType(WT_CLAMP);
-      rend_SetMipState(0);
-      for (i = rcount - 1; i >= 0; i--) {
-        RenderLightmapFace(rp, State_elements[i].facenum);
-      }
-      rend_SetWrapType(WT_WRAP);
-      rend_SetMipState(1);
-    }
   }
 }
 
@@ -3462,12 +3445,10 @@ void RenderMine(int viewer_roomnum, int flag_automap, int called_from_terrain) {
     g3_SetFarClipZ(VisibleTerrainZ);
 
     if ((Terrain_sky.flags & TF_FOG) && (UseHardware || (!UseHardware && Lighting_on))) {
-      rend_SetZValues(0, VisibleTerrainZ);
       rend_SetFogState(1);
       rend_SetFogBorders(VisibleTerrainZ * .85, VisibleTerrainZ);
       rend_SetFogColor(Terrain_sky.fog_color);
-    } else
-      rend_SetZValues(0, 5000);
+    }
   }
 
   // First render mirrored rooms

Descent3/terrainrender.cpp

@@ -1406,15 +1406,11 @@ void RenderTerrain(uint8_t from_mine, int left, int top, int right, int bot) {
 
 #ifndef NEWEDITOR
   if ((Terrain_sky.flags & TF_FOG) && (UseHardware || (!UseHardware && Lighting_on))) {
-    rend_SetZValues(0, VisibleTerrainZ);
     rend_SetFogState(1);
     rend_SetFogBorders(VisibleTerrainZ * Terrain_sky.fog_scalar, Far_fog_border);
     rend_SetFogColor(Terrain_sky.fog_color);
-  } else
-#endif
-  {
-    rend_SetZValues(0, 5000);
   }
+#endif
 
   // And display!
   if (nt > 0) {
@@ -2586,8 +2582,7 @@ void DisplayTerrainList(int cellcount, bool from_automap) {
     rend_SetTextureType(TT_LINEAR);
     rend_SetAlphaType(ATF_CONSTANT + ATF_TEXTURE);
     rend_SetLighting(LS_NONE);
-    if (!StateLimited || UseMultitexture)
-      draw_lightmap = true;
+    draw_lightmap = true;
   }
   RotateTerrainList(cellcount, from_automap);
   if (!UseHardware) {

cmake/shaders.cmake

@@ -0,0 +1,31 @@
+file(WRITE ${shaders_h} "#pragma once
+#include <string_view>
+namespace shaders {
+")
+
+set(idx 0)
+set(idx_is_path FALSE)
+while(${idx} LESS ${CMAKE_ARGC})
+    if(idx_is_path)
+        set(shader_path ${CMAKE_ARGV${idx}})
+        cmake_path(GET shader_path STEM shader_name)
+        file(READ ${shader_path} content)
+        file(APPEND ${shaders_h} "
+inline constexpr std::string_view ${shader_name} = R\"shader(${content}
+)shader\";
+")
+    else()
+        if(${CMAKE_ARGV${idx}} STREQUAL "--")
+            set(idx_is_path TRUE)
+        endif()
+    endif()
+    math(EXPR idx "${idx} + 1")
+endwhile()
+
+foreach(idx RANGE ${CMAKE_ARGC})
+endforeach()
+
+file(APPEND ${shaders_h} "
+} // namespace shaders
+")
+

editor/TextureGrWnd.cpp

@@ -610,7 +610,6 @@ void CTextureGrWnd::TexGrStartOpenGL() {
     // rend_SetOpenGLWindowState (1,Descent,NULL); // LGT: not defined anymore
     rend_ClearScreen(0);
     StateLimited = 1;
-    UseMultitexture = 0;
     NoLightmaps = false;
   }
 }

lib/3d.h

@@ -259,14 +259,6 @@ struct g3Point {
 
 // Functions in library
 
-// 3d system startup and shutdown:
-
-// initialize the 3d system
-void g3_Init(void);
-
-// close down the 3d system
-void g3_Close(void);
-
 // Frame setup functions:
 
 // start the frame, specifying view position, matrix, & zoom
@@ -430,7 +422,6 @@ void g3_DrawSpecialLine(g3Point *p0, g3Point *p1);
 // Draws a bitmap on a specific plane.  Also does rotation.  Angle of rotation is passed as 'rot_angle'
 void g3_DrawPlanarRotatedBitmap(vector *pos, vector *norm, angle rot_angle, float width, float height, int bm);
 
-void g3_TransformVert(float res[4], float pt[4], float a[4][4]);
 void g3_TransformMult(float res[4][4], float a[4][4], float b[4][4]);
 void g3_TransformTrans(float res[4][4], float t[4][4]);
 void g3_GetModelViewMatrix(const vector *viewPos, const matrix *viewMatrix, float *mvMat);

lib/renderer.h

@@ -307,13 +307,6 @@ class oeApplication;
 
 #define TEXTURE_WIDTH 128
 #define TEXTURE_HEIGHT 128
-#define TEXTURE_BPP 2
-
-#define FLAT_SHADE_COLOR 0x7C01
-// If an incoming texture has the above color in it, change that color to this color
-#define REPLACEMENT_COLOR 0x07C0
-
-extern int Triangles_drawn;
 
 // Is this hardware or software rendered?
 enum renderer_type {
@@ -327,29 +320,15 @@ extern renderer_type Renderer_type;
 
 // renderer clear flags
 #define RF_CLEAR_ZBUFFER 1
-#define RF_CLEAR_COLOR 2
 
 // Overlay texture settings
 #define OT_NONE 0           // No overlay
 #define OT_BLEND 1          // Draw a lightmap texture afterwards
-#define OT_REPLACE 2        // Draw a tmap2 style texture afterwards
-#define OT_FLAT_BLEND 3     // Draw a gouraud shaded polygon afterwards
-#define OT_BLEND_VERTEX 4   // Like OT_BLEND, but take constant alpha into account
-#define OT_BUMPMAP 5        // Draw a saturated bumpmap afterwards
-#define OT_BLEND_SATURATE 6 // Add a lightmap in
-
-extern uint8_t Overlay_type;
-extern int Overlay_map;
-extern int Bumpmap_ready, Bump_map;
+
 extern float Z_bias;
 extern bool UseHardware;
 extern bool StateLimited;
 extern bool NoLightmaps;
-extern bool UseMultitexture;
-extern bool UseWBuffer;
-extern bool UseMipmap;  // DAJ
-extern bool ATIRagePro; // DAJ
-extern bool Formac;     // DAJ
 
 class NewBitmap;
 
@@ -361,8 +340,6 @@ void rend_SetRendererType(renderer_type state);
 
 #define MAP_TYPE_BITMAP 0
 #define MAP_TYPE_LIGHTMAP 1
-#define MAP_TYPE_BUMPMAP 2
-#define MAP_TYPE_UNKNOWN 3
 
 // lighting state
 enum light_state {
@@ -406,19 +383,12 @@ enum texture_type {
 #define AT_CONSTANT_TEXTURE_VERTEX 7   // Use all three (texture constant vertex)
 #define AT_LIGHTMAP_BLEND 8            // dest*src colors
 #define AT_SATURATE_TEXTURE 9          // Saturate up to white when blending
-#define AT_FLAT_BLEND 10               // Like lightmap blend, but uses gouraud shaded flat polygon
-#define AT_ANTIALIAS 11                // Draws an antialiased polygon
 #define AT_SATURATE_VERTEX 12          // Saturation with vertices
 #define AT_SATURATE_CONSTANT_VERTEX 13 // Constant*vertex saturation
 #define AT_SATURATE_TEXTURE_VERTEX 14  // Texture * vertex saturation
-#define AT_LIGHTMAP_BLEND_VERTEX 15    //	Like AT_LIGHTMAP_BLEND, but take vertex alpha into account
-#define AT_LIGHTMAP_BLEND_CONSTANT 16  // Like AT_LIGHTMAP_BLEND, but take constant alpha into account
 #define AT_SPECULAR 32
 #define AT_LIGHTMAP_BLEND_SATURATE 33 // Light lightmap blend, but add instead of multiply
 
-#define LFB_LOCK_READ 0
-#define LFB_LOCK_WRITE 1
-
 enum wrap_type {
   WT_WRAP,  // Texture repeats
   WT_CLAMP, // Texture clamps
@@ -430,8 +400,6 @@ struct rendering_state {
 
   int8_t cur_bilinear_state;
   int8_t cur_zbuffer_state;
-  int8_t cur_fog_state;
-  int8_t cur_mip_state;
 
   texture_type cur_texture_type;
   color_model cur_color_model;
@@ -440,13 +408,8 @@ struct rendering_state {
 
   wrap_type cur_wrap_type;
 
-  float cur_fog_start, cur_fog_end;
-  float cur_near_z, cur_far_z;
-  float gamma_value;
-
   int cur_alpha;
   ddgr_color cur_color;
-  ddgr_color cur_fog_color;
 
   int8_t cur_texture_quality; // 0-none, 1-linear, 2-perspective
 
@@ -467,7 +430,6 @@ struct renderer_preferred_state {
 struct renderer_lfb {
   int type;
   uint16_t *data;
-  int bytes_per_row;
 };
 
 struct tRendererStats {
@@ -523,9 +485,6 @@ void rend_SetFiltering(int8_t state);
 // Sets the state of zbuffering to on or off
 void rend_SetZBufferState(int8_t state);
 
-// Sets the near and far planes for z buffer
-void rend_SetZValues(float nearz, float farz);
-
 // Sets a bitmap as an overlay to rendered on top of the next texture map
 void rend_SetOverlayMap(int handle);
 
@@ -641,9 +600,6 @@ int rend_InitOpenGLWindow(oeApplication *app, renderer_preferred_state *pref_sta
 // Shuts down OpenGL in a window
 void rend_CloseOpenGLWindow();
 
-// Sets the state of the OpenGLWindow to on or off
-void rend_SetOpenGLWindowState(int state, oeApplication *app, renderer_preferred_state *pref_state);
-
 // Sets the hardware bias level for coplanar polygons
 // This helps reduce z buffer artifaces
 void rend_SetCoplanarPolygonOffset(float factor);

misc/holder.h

@@ -0,0 +1,41 @@
+/*
+* Descent 3
+* Copyright (C) 2024 Descent Developers
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program 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 General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <utility>
+
+template <typename T, void (*Deleter)(T)>
+struct MoveOnlyHolder {
+  MoveOnlyHolder(T t)
+      : t_{std::move(t)} {}
+
+  MoveOnlyHolder(MoveOnlyHolder&& other)
+      : t_{std::exchange(other.t_, {})} {}
+
+  ~MoveOnlyHolder() noexcept {
+    Deleter(t_);
+  }
+
+  operator T() const {
+    return t_;
+  }
+
+private:
+  T t_;
+};